Apart from some having different internal names and file names, they each had a different number of tags in the tag table as well as different header information and file sizes. Admittedly I know nothing of tag tables or the inner workings of ICC profiles, so it's quite possible that they all would render images exactly the same. But it did give me pause since I had to choose one to use - Would the real ProPhoto please stand up? hehe Rather than open that can of worms I went with the PS7 version figuring if I'm wrong so are a lot of other people out there
Anybody have an idea why there are different versions or what the differences are?