are unity and unreal so different that your 10 years of experience in one isn’t helpful for the other? i’m not a game developer but I had assumed it was similar to web frameworks - definitely high switching costs for porting an existing project, but as a developer looking for a job there are still many portable skills.
i’d guess it also depends on what parts of the engine you are working in?
my guess is the software equivalent is the architect role - basically someone high level that doesn’t code much but does design the overall way that systems interact (or, to put it redundantly, designs the architecture of the full system)
however i don’t know if this term is en vogue as much anymore except for very large scale businesses (i would bet money that banks employ architects, for example)