Thanks for the quick reply!
Mark - I want to compare the profiles in a 3D gamut viewer app and see the shape.
Different scanners have different DMax and different gamut capabilities, so to make a valid comparison of the how different targets perform in their own right, you need to neutralize all variables except the target, which means using the same scanner for generating the profiles from the different targets, and ideally, though perhaps not always feasible, the same profile making software, because the math may differ between software versions.