That's why I prefer a macro assembler! The relevant bits can be extracted into included files.
You make an important point about pentiums. They only thing they have in common is the branding. I have a Pentium III here, in a laptop and I could not use that to develop Willamette or Northwood code.
While it makes sense for corporations to be "all p3" or "all p4" there is no logical basis for being "all intel" except for the 'intel inside" sticker. There is a basis for using intel chipsets instead of via's but that has passed now we have HT and nForce.