Is there an overlap between Asperger's and ADD?

I was diagnosed with Asperger's about 17 years ago. Sometimes I notice ADD traits in myself.

I've got 4 books on the go at once, it's rare for me to focus on one thing.

When I'm online I'll have about 25 tabs open at the same time. I struggle to remember what I'm interested in or doing because I keep thinking of something else I want to do. That's why all the tabs are open, to remind me of things I've been doing or reading about.

Would this indicate I should seek a diagnosis of ADD or is it a standard overlap that many people experience?