They run great like that. I started buying every K part I could starting in the 80s. Many subtle changes some big through the years without much info. For a motorcycle that almost didn't happen.
Often I've found non factory changes people did like your head swap and figured it out later. My first 56KHK had Chevy Intake Valves, 2mm larger than KH, KHK. So at first, ah, KHK valves are a little bigger! Than John Clued me in, no such K valve, and than I noticed the Chevy Style. So after collecting over 20 Ks at one point I started comparing parts. Many small changes some big. Lots of fingers had been in the pies also...haha. Erik