Mainteance planner vs Project planner

Hi, Everybody,

my question is to guys who have an experince in both, maintenance and project planning, is it very different subjects or at the end of day they are much more similar,

I am doing mainteance planning, shutdown and small modifications projects mainly, I’d like to apply for project planner positions, and actually I’ve done some but unsuccessfuly, now trying to find out the reason

many thanks