iPad7 part interchangability with ipad 8 nor 9

Can I use most of iPad 7 part for either ipad 8 and 9?

i'm considering

1st option: replace the current mobo with an ipad 8 motherboard

will everything work since it's almost the same(the only difference is the mobo)
2st option: replace the current mobo with an ipad 9 motherboard, current cam to 9th gen's cam

will it work?

current known: 7th lcd interchangable with 8 and 9

digitizer work on 8 but not 9 (will truetone work if I change the digitizer)

battery is the same on 3