From the little I've seen of pottery around here, I seldom see 2 decorated pieces that look like another. I only have an ice cream pail about full of small pieces that I have found, and I have a little I've acquired, so I don't have much experience with it.
BUT, at some time some body tossed a fairly modern pot of the stuff that likely came out of a tourist trap in Mexico. Now those pieces sick out like a sore thumb when i see them.