Create comparisons of "Product 1" vs "Product 2" right inside Google Sheets.

Code.gs

// Add the function to main menu
function onOpen() {
  var ui = SpreadsheetApp.getUi();
  ui.createMenu('🎉')
      .addItem("Create Comparisons", "productComparison")
      .addToUi();
}

// Function to create comparisons
function productComparison() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getActiveSheet();
  var data = sheet.getDataRange().getValues();
  var comparisonData = [];
  
  // Creating sheet "Comparison" and setting the headers dynamically
  var comparisonSheet = ss.insertSheet("Comparison");
  var headers = [];
  data[0].forEach(function(e) {
    headers.push(e + ' 1');
    headers.push(e + ' 2');
  });
  comparisonSheet.appendRow(headers);

  // Creating comparison data
  for (var i = 1; i < data.length; i++) {
    for (var j = i + 1; j < data.length; j++) {
      var row = [];
      data[0].forEach(function(e, k){
        row.push(data[i][k]);
        row.push(data[j][k]);
      });
      comparisonData.push(row);
    }
  }

  // Writing the data to "Comparison" sheet
  comparisonSheet.getRange(2, 1, comparisonData.length, comparisonData[0].length).setValues(comparisonData);
}

If your data in Google Sheets look like the below screenshot before running the script:

Then it will look like the below screenshot after running the above script:

Just copy-paste the above script under Extensions > Apps Script and hit Run; you may asked for some permissions, allow them, and within seconds, all the combinations will be created.