What I can't understand (by now...) is that histograms of the same file (not any adjustment for fff) opened in Camera Raw are not the same for fff and 3FR on MY computer (MacBook Pro M1 14", Ventura 14.3.1). fff files are a little bit darker, but histograms end in superposing when increasing a little the exposure value of the fff image.
Histograms of the same fff file opened in Camera Raw and in Phocus are a little different (that I can understand, as the demosaicing algorithms of Phocus and Camera Raw are not the same).