Turned down a promotion to move sideways into a team doing more interesting work, and I keep waiting to regret it

The promotion was a real one — title bump, decent raise, more scope on a team I know well. Turned it down for a lateral move to a team working on something I actually find interesting, same level, similar pay. Told my manager the honest reason and she was surprisingly supportive about it, which helped. It's been six weeks on the new team and most days I'm glad, though there's a specific kind of doubt that shows up whenever a former peer mentions their new title. Trying to remind myself that title and interest aren't the same axis and I optimized for the one that actually mattered to me.