I have two Inkworks Supernatural season2 dealer pieceworks incentive cards PW-12A
One has what looks like a row of buttons
One is just a plain unadorned patch
Would these be regarded as variants
Piko

Some collectors consider those to be variants and chase those as well. If you do a search for "variant" or "pieceworks," you will see numerous pages of posts related to that. Sadly, a lot of the links to images are broken.