Fundamentals ARE fundamentals, as someone else said. But, there are differences between the two (sighting systems). Scopes are "single-plane" sighting systems....one does NOT have to "line up" a front and rear sight. So, scopes are actually easier to use and master. Irons are definitely more difficult. That is one reason, I believe, that everyone seems to gravitate towards scopes (like everything else these days, EASIER is automatically the way most people go). I have gone back to irons, myself. I like the challenge - and the simplicity.
I believe that being good with irons will make you better with scopes. But, not the other way around. I'd say shoot the irons for a while. That will make you a better shooter all 'round.