"New" Mobos on "older" Filter

I found an eBay lot of used and not finished Shruthi “old” Filter bords (Ladder, Roland, CEM3379…).
I have some “newer” Control Boards available, both Shruthi1 and XT.
Can I put an old Filter board under a new Control board (v0.8 from the current Github, or V03 for the XT)?
Are they compatible? Will they work? Will I fry something?
(it looks like they work, but I often get some stuck notes that last forever…)