Yes, I generally have a heavy overlap between my requests and offers. And that means nominations, too, since I want to be sure the things I want are in the tag set.

In some exchanges, I also write "treats", i.e. extra gifts. There I write more widely, sometimes in fandoms I've never written before (but have read/watched), because the prompt inspires a plot bunny. However, for my formal offers, I take care to play it safe.