Managing shared photos

I want to take photos from a Shared Album and import them into my library (in case the album ever gets deleted). However, when I do that, it just brings them in and I can’t tell if I took the photo or if someone else did. (I just took a big vacation with many people.)

a) Forgetting the reason why I want that info, what is the easiest way to determine if it’s my photo or someone else’s photo after it’s in my library?

b) In the Shared album itself, is there a way to determine whether it’s a photo I uploaded or someone else’s photo?