Of course we are all are designers of our own collections (and we should be) but I think we should all have some guidelines when dealing with other collectors.

For my collection:

I consider anything the casino puts on will not make a variation. That includes different type fonts or stickers, and also whether the names are screened or embossed.

Printing errors (such as color changes or registration shifts) should not make a variation.

Some reprints are obvious(darker type and some loss of detail) but I don't consider them variations unless there is something added or left out.