The reviews I'm looking at don't compare the 7700K and 7700X. But if you find something newer like a 10400 or 12100 near the bottom of multi-threaded charts, and those are faster than the 7700K, then that should give you an idea.
There are several reviews that misspell 7700X as 7700K in the text.
10-04-2022 at 10:35 AM
There's no perfect, one size fits all benchmark, but Cinebench (R23) is frequently referenced.