Do newer revision CPU/PPU work on older revision motherboards?

[hippy dave]

Hello
So I quite recently got myself my first real Famicom, I went for a red & white one for the full retro *aesthetic*, bought it from a seller who did a nice clean up/refurb, mod for composite output and 5v USB input etc.

It's a revision 7 board (HVC-CPU-07) with revision E chips. It's working great, none of the glitches of the really old revisions, but the one thing it turns out I miss is the readable OAMDATA/palette RAM of the G/H revisions, because I got a (clone) everdrive and like the option of using save states. Reloading a save state will trash the palette and turn most stuff black, so is unusable during gameplay, I can work around for games where I save at a point where it's about to refresh it all (eg SMB lives remaining screen or Metroid password screen, before returning to gameplay) but not all games have a convenient moment like that, plus it would be nice to be able to use it at any arbitrary point.

So hypothetically would it work if I swapped revision G or H chips onto my revision 7 board? IDK if I'm committed to this idea yet but would be good to know my options. I'd probably put sockets in if I were doing it.

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Tangential revision-related question while I'm here: I read in older threads that the red & white Famicoms that have the FF logo on the front sticker are always newer models that have a one-piece motherboard, whereas mine has the older design with the RF and power stuff on a separate board. It does have the FF logo on the sticker tho - is this a combination that actually happened back in the day, or is it more likely that the seller put a different sticker on? This one's just for curiosity.

Thanks!