I believe R7000 utilize Shimano new SLR EV cable pull on the brake levers whereas Tiagra 4600 calipers use the older "new super SLR"
I Think the cable pull is the same for both.
Oh. And to clarify Tiagra 4700 rear derailleurs are basically the same as any Shimano 11sod derailleur, geometry wise. They're just heavier and hence cheaper. It's the lever that is a unique component with its own gear cable pull.