Bivol can move - better than Gvozdyk, but Beterbiev is just relentless. How he broke Gvozdyk down to the body was stunning and you can expect a similar pattern here.
On relative balance I lean toward the boxer vs the puncher. The difference here is that Bivol's excellent boxing ability is < than Beterbiev's relentlessness and power. Bivol isn't a natural LHW either. It will tell late on. Late stoppage.