Number 6 for your oc questions?
6: Two OCs of yours that look alike despite not being related?
I reuse a lot of elements of my OC designs, and sometimes whole-cloth recreate them cross-fandom or in new projects. The first thing that comes to mind, though, is Xaphen (they/them) and Uriel (they/she) from my angel stories -- both of them are flame-based, and while their 'true' forms are relatively different-looking, their human guises ended up looking really similar, mainly due to my choice for their hair.
They used to look even more similar, but I've defined their designs throughout the years -- this story is around a decade old, and my art's improved a lot since then.
For a somewhat sweeter answer, though, my OC Edith Truscott-Fanshawe (she/her) shares a lot of visual similarities with my friend @cadyllonflow's OC Solana Bradshaw (she/her), and they're both English as well, though from different parts of the country. As a result, Lana often ends up adopted (or at least accepted, if she's too old for adoption proceedings) into the Truscott-Fanshawe family, giving her the loving home she so deeply deserves!
They're also both autistic, though they present very differently -- Edie's expression rarely changes, but she loves Lana with a ferocity unmatched.