How mismatched for it to cause problems or for it to be enough for people on the internet blaming it on that? In both cases I don't know tho.
I haven't visited the issue in a couple of years so hopefully that's not a thing anymore
Currently my displays work fine too, different refresh rates and bit depth (but not really, dithered 6 bit or smth).
I've seen people being shat on for crazy things, my personal favorite is when the only solution given to a problem is buy something better