Writers, do you carry characterisations/head-canons/established themes from one fic to the next..?

..Or make subtle references to your other fics in a new one?

I'm working on a WIP that I had shelved, and I'm finding so many little similarities between this fic and one I wrote during that hiatus, mostly a lot of head-canons about characters that are the same in both fics.

And these are both wildly different AUs, written in a different style and time period.. Yet I think it's so obvious that I wrote both of these.

I'm all self conscious about it now 😂 idk if anyone but me would notice, and these aren't even intentional overlaps, but I found myself wondering if other people ever do this, either purposely or subconsciously.