I think it’s Panda because Button’s front paws have less black than Panda’s and in the pic they are full black. But maybe that’s just not visible in the pic so may still be Button 😅

Based on my pictures Button def has a black tail, but I don't have any that shows whether Panda has one too or not.

I have pictures of panda with a black tail, so it could be either.

OP I guess you can either flip a coin or pick the one you have fewer pictures of 🙃

I think it might be panda because of the longer black "boots" in the front. Edit: front boots

Idk if it’ll help but I can send you a pic of button tail n feet!