Intel modems might be decent, definitely cheaper than Qualcomm, but they no way as fast or come near to being fast as Qualcomm ones.
No. Apple NEVER lets you get away with using previous year phone parts in the current year’s phones!! HAH!
iFixit still is the #1 on teardown - the Dutch guys were first, but no way as detailed as iFixit guys always are.
the screens are not interchangeable b/c the size dimensions are different - 5.8” vs 6.5” screen sizes
LG makes Apple screens buddy, the days of Samsung and Apple for screens been over since 2017 - as well as Apple & Qualcomm for modems - they are all at “war” - all modems are made by Intel, even though Intel modems can’t beat Qualcomm, nor LG’s screens cant beat Samsung.