I don't think you can call last season "swapping back and forth a few times". His season was well and truly a disaster before Rd 21 when he played his first game on the wing in 2024.
He played 21 games for the Broncos as follows:
Centre (17 games)
Pre-Season Challenge
Rd 1-10
Rd 12
Rd14-15
Rd 17-18
Rd 27
Fullback (1 game)
Rd 11
Wing (3 games)
Rd 21
Rd 25
Rd 26
Did Not Play
Rd 13
Rd 16
Rd 19
Rd 20
Rd 22
Rd 23
Rd 24
See link below
Selwyn Cobbo Career Games
He played the majority of last season at Centre in 2024. He was only swapped to the wing, right at the end of the season, so that should have played zero factor in his form until Rd 21.
In 2023, he played the whole season on the wing and scored piles of tries. So he can play both positions. There are many players that can play both. Most centres and wingers will have swapped between positions before, particularly if you've been playing footy a long time. Different jobs, yes. Beyond players to be versatile enough to cover both, no.