https://www.cardboardconnection.com/...all-variations

The 2020 Donruss Baseball variations continue to operate on the belief that variations don't need to be rare to have a place in the Panini MLBPA lineup. The cards make simple changes - normally nicknames or image swaps - and they are not very hard to find.

It appears Panini added a helpful way to spot the variations. If you flip the card to the back, the variations feature a retro Donruss logo in red instead of the standard black-and-white version.

Click on the link above to look at the 2020 Donruss Baseball Variations Guide.