You have two different rifles, and more than likely they are chamber by a different reamer. So there probable going to be a difference in the chambering size. You could use fingernail polish and mark the cases at the base applying the polish on the lettering. Marking one set of brass for one rifle. I am not sure just how it will stay on during cleaning, I haven't tried it. It would be a trail to see if it holds on. I reload for several 25-06's and there I use different caliber brass and size them to 25-06. Such as 36-06, 7mm, 280, and 270. That way I knew which case went to which rifle. Otherwise keep the brass separate. Further the lands possible possible at a different length from bolt face. To many variables.