I don't see the caliber in the initial post but see you put 300blk in the response. Just a helpful tip would be to put as much info as you can in the first post. Rifle, barrel length, bullet, powder, running subs/supers, etc. I know you put some of that info but try to put it all in a concise form so guys can look at your situation with all details.
If you've been running rem 7.5's already and its good to go for you, then simply switching brands will most likely not cause an issue when you're running a reduced load like subsonics in 300blk. To be safe, I would reduce your charge by 0.5 gr and try the new primers, if nothing seems off, bump back up to your 11.3gr and make sure its good.
To be clear, switching primers doesn't always increase pressure. If 7.5's have you running ~1000fps, switching primers may actually bring you down a bit, so you might have to add a touch of powder.
Always just reduce to be safe and then work right back up. It only takes a few rounds to do the test.