Its not just 2 skins, mate. Its 2 new models since the uniform of an American para is not just a skinning of a American ranger, or the normal Here/ SS uniform the same-minus-'skins' as the FJs.
Ironically, this makes more sense to work on than skins because it can be reused in any map made for paras, not only Crete, PHL, Sfakia and Ramelle... Oh, wait... It already is :-P
Aside,
Since not all those battles DID involve rangers though, what is the difference between the current uniform for Yanks and the regular GI?