I am not sure if this is still the case, but be aware that a specific CRF on x26...

antibuddy on April 26, 2021 | parent | context | favorite | on: How Facebook encodes videos

I am not sure if this is still the case, but be aware that a specific CRF on x264 vs x265 might mean a different (perceived) quality. It was certainly the case a few years ago.

astrange on April 26, 2021 [–]

I think so. It's also different in 8-bit and 10-bit.