Can i switch sim card between 2 of the same kind of iphone?

I broke my iphone 4s but the sim card is still working and I have another iphone 4s with the same carrier and I was wondering will it work if I switch the sim card

Sure it will work, no problems.

I don't see why not.

Yes. I don't know about other cellphone carriers but I have AT&T, and they do not charge an activation fee when you switch iPhones yourself, instead of going through the AT&T store. Hope that I helped