I jar buds from the different phenos of the same cross, no worries.
I would not jar plants together that were different parents, natch.
Unless the buds are identical, I wouldn't. Jars are cheap. Use two.
Even when you are trying to judge them against each other to find a keeper?
So you haven't tried jarring plants from different parents together?
I do wonder if they would keep the same profiles than if kept alone. Will try it in a small jar with my next harvest if I remember.