They (Gore and the individual manufacturers) make this stuff difficult to figure out, ... said more correctly is that there's a distinct combination of marketing mixed in with textile technology in these names and naming conventions.
That would be as opposed to some standard naming convention, such as ASTM or some industry-specific group, endorses. I think what noggin said is correct, and I can add then PTFE stands for the chemical name of the actual Gore Tex XCR membrane (Poly Tetra something something).
If you really have to know, call up Gore's customer support line. Gore is very adamant about protecting their name in licensing the use of their fabrics. In so doing, they document, test, review and approve each and every product made by every manyfacturer that uses/licenses the Gore Tex fabric, and they keep detailed records of the tests. I'll guess that someone could translate those 'marketing' product names to something useful.