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Comparing two COPs of the same part

Hello,

We use our arm for measuring parts after test. Right now trying to see if we can compare a scan of a sample taken before test to a scan of the same sample taken after test. Our romer arm and sample fixture don't move so I don't think I need to worry about doing any sort of alignment... yet. Does anybody know if there is a way to do a colormap between two scans instead of between a CAD and a scan?

I tried exporting one of the scans to an IGES and then importing the same IGES to try the scan but nothing showed up.