I have to go with the more proven fighter here but wouldn't be surprised if Jalolov won. His style would be more difficult for Whyte compared with Itauma. Don't know how good Jalolov is after 12 rounds, nor whether he can take a shot to head or body. If he can actually prove that against decent opposition rather than some part-timers then I'll back Jalolov. Olympic gold is strong amateur pedigree but it doesn't always translate to the pros such as Yoka and Audley Harrison.
To me this is not immediately obvious. Whyte looked terrible in his last fight, but Jalolov has barely been pushed by anyone in the pros or amateurs for years, can he even fight passed eight rounds? I think I'm leaning towards Whyte here in a gritty, messy win. Jalolov could easily win it though.
I'd go with the more proven, experienced fighter in Pro's which is Whyte. This is a very specific match up, has it been announced or something?? Let's see what version Whyte we get against Joyce. IMO Whyte's best form was against Povetkin 1 despite getting KOd, against Rivas, and against Chisora 2 and Brown. He was in contest shape, 247 mark and sharp/hard hitting/calculated.