Help me ID these cherries

I planted a Stella and a Bing cherry on the same spot, and this year, one of the trees produced fruit. However, I don’t know which tree is which because I lost the labels. I’m planning to plant the seeds, so I need to make sure what variety they are.

I have both in my yard. Bing gets super dark red on the outside and inside, the taste is very intense when fully ripe. Stella does not get nearly as dark on the exterior or interior, the flavor is very mild by comparison.