AhHa!

Now that I know what you mean by invisible, I may be able to help.

If there are different actor names in the  two files you will end up with missing parts. If the cr2 calls for "rHip" and the equivalent geometry is named "rightHip," the part will not load and will be "invisible."

They are not invisible, they are simply not there.

You'll have to load each into a text editor and work your way through the actor name structures to see where they differ. 

HTH,

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