diff --git a/DQM/SiPixelHeterogeneous/plugins/SiPixelCompareTrackSoA.cc b/DQM/SiPixelHeterogeneous/plugins/SiPixelCompareTrackSoA.cc
index 5bf47573cffe8..b6c66531da306 100644
--- a/DQM/SiPixelHeterogeneous/plugins/SiPixelCompareTrackSoA.cc
+++ b/DQM/SiPixelHeterogeneous/plugins/SiPixelCompareTrackSoA.cc
@@ -208,6 +208,7 @@ void SiPixelCompareTrackSoA<T>::analyze(const edm::Event& iEvent, const edm::Eve
     nLooseAndAboveTracksCPU_matchedGPU++;
 
     hchi2_->Fill(tsoaCPU.chi2(it), tsoaGPU.chi2(closestTkidx));
+    hCharge_->Fill(tsoaCPU.charge(it), tsoaGPU.charge(closestTkidx));
     hnHits_->Fill(tsoaCPU.nHits(it), tsoaGPU.nHits(closestTkidx));
     hnLayers_->Fill(tsoaCPU.nLayers(it), tsoaGPU.nLayers(closestTkidx));
     hpt_->Fill(tsoaCPU.pt(it), tsoaGPU.pt(closestTkidx));
@@ -217,7 +218,8 @@ void SiPixelCompareTrackSoA<T>::analyze(const edm::Event& iEvent, const edm::Eve
     hz_->Fill(tsoaCPU.zip(it), tsoaGPU.zip(closestTkidx));
     htip_->Fill(tsoaCPU.tip(it), tsoaGPU.tip(closestTkidx));
     hptdiffMatched_->Fill(tsoaCPU.pt(it) - tsoaGPU.pt(closestTkidx));
-    hCurvdiffMatched_->Fill((tsoaCPU.charge(it) / tsoaCPU.pt(it)) - (tsoaGPU.charge(closestTkidx) / tsoaGPU.pt(closestTkidx)));
+    hCurvdiffMatched_->Fill((tsoaCPU.charge(it) / tsoaCPU.pt(it)) -
+                            (tsoaGPU.charge(closestTkidx) / tsoaGPU.pt(closestTkidx)));
     hetadiffMatched_->Fill(etacpu - tsoaGPU.eta(closestTkidx));
     hphidiffMatched_->Fill(reco::deltaPhi(phicpu, tsoaGPU.phi(closestTkidx)));
     hzdiffMatched_->Fill(tsoaCPU.zip(it) - tsoaGPU.zip(closestTkidx));
@@ -242,7 +244,7 @@ void SiPixelCompareTrackSoA<T>::bookHistograms(DQMStore::IBooker& iBook,
 
   // clang-format off
   std::string toRep = "Number of tracks";
-  // FIXME: all the 2D correlation plots are quite heavy in terms of memory consumption, so a as soon as DQM supports either TH2I or THnSparse
+  // FIXME: all the 2D correlation plots are quite heavy in terms of memory consumption, so a as soon as DQM supports THnSparse
   // these should be moved to a less resource consuming format
   hnTracks_ = iBook.book2I("nTracks", fmt::sprintf("%s per event; CPU; GPU",toRep), 501, -0.5, 500.5, 501, -0.5, 500.5);
   hnLooseAndAboveTracks_ = iBook.book2I("nLooseAndAboveTracks", fmt::sprintf("%s (quality #geq loose) per event; CPU; GPU",toRep), 501, -0.5, 500.5, 501, -0.5, 500.5);
diff --git a/DQM/SiPixelHeterogeneous/plugins/SiPixelTrackComparisonHarvester.cc b/DQM/SiPixelHeterogeneous/plugins/SiPixelTrackComparisonHarvester.cc
index 8d6d10111986a..02cdc72830e44 100644
--- a/DQM/SiPixelHeterogeneous/plugins/SiPixelTrackComparisonHarvester.cc
+++ b/DQM/SiPixelHeterogeneous/plugins/SiPixelTrackComparisonHarvester.cc
@@ -7,12 +7,16 @@
 #include "FWCore/ParameterSet/interface/ParameterSet.h"
 #include "FWCore/ServiceRegistry/interface/Service.h"
 #include "FWCore/Framework/interface/MakerMacros.h"
+
+// for string manipulations
+#include <fmt/printf.h>
+ 
 class SiPixelTrackComparisonHarvester : public DQMEDHarvester {
 public:
   explicit SiPixelTrackComparisonHarvester(const edm::ParameterSet&);
   ~SiPixelTrackComparisonHarvester() override = default;
   void dqmEndJob(DQMStore::IBooker& ibooker, DQMStore::IGetter& igetter) override;
-
+  void project2DalongDiagonal(MonitorElement* input2D, DQMStore::IBooker& ibooker);
   static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);
 
 private:
@@ -45,6 +49,56 @@ void SiPixelTrackComparisonHarvester::dqmEndJob(DQMStore::IBooker& ibooker, DQMS
 
   hpt_eta_matchRatio->divide(hpt_eta_tkAllCPUmatched, hpt_eta_tkAllCPU, 1., 1., "B");
   hphi_z_matchRatio->divide(hphi_z_tkAllCPUmatched, hphi_z_tkAllCPU, 1., 1., "B");
+
+  // now create the 1D projection from the 2D histograms
+  std::vector<std::string> listOfMEsToProject = {"nTracks",
+                                                 "nLooseAndAboveTracks",
+                                                 "nLooseAndAboveTracks_matched",
+                                                 "nRecHits",
+                                                 "nLayers",
+                                                 "nChi2ndof",
+                                                 "charge",
+                                                 "pt",
+                                                 "eta",
+                                                 "phi",
+                                                 "z",
+                                                 "tip"};
+  for (const auto& me : listOfMEsToProject) {
+    MonitorElement* input2D = igetter.get(topFolder_ + "/" + me);
+    this->project2DalongDiagonal(input2D, ibooker);
+  }
+}
+
+void SiPixelTrackComparisonHarvester::project2DalongDiagonal(MonitorElement* input2D,
+                                                                   DQMStore::IBooker& ibooker) {
+  if (input2D == nullptr) {
+    edm::LogError("SiPixelTrackComparisonHarvester")
+        << "MEs needed for diagonal projection are not found in the input file. Skipping.";
+    return;
+  }
+
+  ibooker.cd();
+  ibooker.setCurrentFolder(topFolder_ + "/projectedDifferences");
+  const auto& h_name = fmt::sprintf("%s_proj", input2D->getName());
+  const auto& h_title = fmt::sprintf(";%s CPU -GPU difference", input2D->getTitle());
+  const auto& span = (input2D->getAxisMax() - input2D->getAxisMin());
+  const auto& b_w = span / input2D->getNbinsX();
+  const auto& nbins = ((input2D->getNbinsX() % 2) == 0) ? input2D->getNbinsX() + 1 : input2D->getNbinsX();
+
+  MonitorElement* diagonalized = ibooker.book1D(h_name, h_title, nbins, -span / 2., span / 2.);
+
+  // collect all the entry on each diagonal of the 2D histogram
+  for (int i = 1; i <= input2D->getNbinsX(); i++) {
+    for (int j = 1; j <= input2D->getNbinsY(); j++) {
+      diagonalized->Fill((i - j) * b_w, input2D->getBinContent(i, j));
+    }
+  }
+
+  // zero the error on the bin as it's sort of meaningless for the way we fill it
+  // by collecting the entry on each diagonal
+  for (int bin = 1; bin <= diagonalized->getNbinsX(); bin++) {
+    diagonalized->setBinError(bin, 0.f);
+  }
 }
 
 #include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"