Hey @yoavdolev,
I remember seeing bits of this pop up in other posts like this one.
From what I can tell you can leave it off and output in ACES2065-1 via the normal color space dropdown menu and pick desired compression.
For ACES compliant files it has to be uncompressed however.
Also make sure that you are reading and exporting your EXRs correctly in both software. Saturation increase sounds like a color space mismatch.