Through week 15, the only week where St. Brown has seen notably more snaps was week 15, though I can't recall if MVS got dinged and was out for part of that game. In that week 15 game St. Brown saw 3 targets, 1 catch, 7 yards while MVS has 2 targets, 1 catch, 12 yards. Overmatched rookies against the Bears.
You can go here
https://www.lineups.com/ for game by game sanp counts screening for GB and WR.
Through week 15, MVS had taken 614 snaps and seen 56 targets, about 11 snaps per target. St. Brown had 348 snaps and 31 targets, the same 11 snaps per target. These numbers do not include penalties.
MVS runs more deep routes; St. Brown has been running more short routes out of the slot in Cobb's absence. All Packer receivers play inside and outside, but for the time being and for the most part that's been their roles.