Ehh.. Personally I would not keep them confined together. Even if they were friendly with each other, turkeys are big louts with no concept of personal space and peafowl definitely have a personal space concept.
If there's conflict, it usually goes 50-50 who comes out on top. Sometimes it's the turkeys bullying the peafowl or vice versa. Here(free range), the turkeys dominate.. there were only 4 turkeys in the front yard but that was enough to make the peafowl stay mainly in the backyard. When I sold off 3, the peafowl finally started coming into the front yard..
Ran into problems keeping the poults and peachicks together- the poults always eventually started to pick at the peachick's crests as soon as these grew.. and often they would pick on several down to the skin leaving a big red pecked out spot. So, I'll never keep them together past around 2 weeks.
I did try keeping peafowl and turkeys confined in same pen for a while- these birds 'got along' without 'problems'.. but the turkey kept annoying the peafowl by getting into their personal space too much and they had zero regard for the peacock while he was displaying.. the turkeys would just peck and yank at his feathers or try to walk right through his tail. So his tail ended up getting damaged by the turkeys.
I'm guessing in your situation, the turkeys will be dominant ones as they were there 'first' and the peafowl grow up with them. If confined, make sure there is way plenty room and not crowded in pen or the turkeys will likely do some damage to peacock's tail.