I have used Dive Rite kits in HOG regs, and Dive Rite kits in Apeks regs, and Dive Rite kits in Beauchat regs...
I think I have also used HOG kits in a Dive Rite reg.
I think DR and HOG will each tell you they use a different proprietary material on the HP seat, but I have not had any issues so far. I use those regs well outside of recreational limits and have never had any issues.
Now, if I was running a shop, I would probably tell customers it would take another few days and order the kit from the same brand...but for my personal use, they seem to each meet enough specs to fit into the other brands just fine, and I will keep mixing and matching with what I have on hand.
That's what I needed to hear! Thank you sir. Looks like you're in SoFlo as well. Hopefully I'll see ya on the boat.