I guess it depends on what NGAL will be. IIRC it will be a hybrid C-17/C5M replacement.
Generally yes however that’s two very different aircraft. Generally a C17 redux would undergo significant modernization if it was selected instead of a completely new design. As part of the Process the USAF is doing an analysis of alternatives.
Guessing some kind of stealth is also planned.
Unless the USAF has been reverse engineering a Romulan Cloaking device, call me skeptical. An aircraft the size of a C130 is huge and Very low Observable Technology has limitations.
If these requirements are downgraded then perhaps a C-17 restart makes sense but only if IMHO. If the claim the F-47 will place too much stress on the fighter industrial chain for F/A XX then the same argument would be applicable to the supply chains for a C-17 and NGAL.
It wouldn’t be the C17A. Or even a C17B (that was conceptualized). Recall that the C17 evolved from the much smaller YC15 and you have the example of the Antonov planes where in you have the AN124 and its bigger AN225. So it’s entirely plausible to develop a bigger version if that is deemed appropriate.
farther we are living decades after the end of the C17 production and this wouldn’t start production until 2038 meaning that any production would likely involve extensive modernization in engines, materials, production technologies and avionics.
Yet that all comes down to the question of whether it seems like the better value as this isn’t a situation where you can have both. C17R would be an alternative to a clean sheet NGAL. It comes down to the question of if the USAF feels that they are in an opportunity and that the technical aspect of a Clean sheet NGAL would be the better investment.