@DurgaDevikaV

Major Version Skimming copies only the highest version of each rule from the previous major version. It excludes withdrawn or deprecated rules. So you cannot rely on rule count.

Generally for any refractor level action in PEGA. It always generates an Audit report in the end for review. The same should have been the case for skimming also. Did it not provided you with the report?

In any case, Skimming is a tried and tested tool in PEGA, so ideally it should have copied all the available rules in the new major version. It should not be causing any discrepancies there.