Question on E46 ///M3 seats into E53

[Dking05]

Trying to retro fit on Pre-LCI 2001 4.4i

I read around the forums a little bit and wanted to come up with a few things about the seat retro-fits.

As some people said,(1) the E46 should be a direct swap? (M3 seats)
Keep in mind that my current seats are non-sport / no lumbar / not heated / electric.
So,(2) would it be possible to use seats from the E46 even though it may have the options i don't? (aka Will the seat still do its basic functions even though the new one has the extras)-in a wiring view, i don't expect the options to work.
(3) Would it be possible to make the lumbar work if the seats came with it?
(4) what would they compatability of E39 m5 seats be?

Reference Picture of what will go in to x5 (from Ebay) (front seats)