See QBR Difference? (Not that I’m even advocating for it but it does take more into account than passer rating)
Passer rating doesn’t tell nearly the whole story. A big pass that the receiver gets tackled at the one and is run in for a td the next play is almost the same real world value as a straight TD but passer rating doesn’t factor in stuff like that. Yards that lead to points in real life are valued more than yards that lead to punts. KC also has 10 rushing TDS which makes sense since it’s harder to scheme open WRs on a condensed field than with 70 yards of open field, remember KC is down heavily on receiving talent. Also Mahomes gets yards with his legs which is just as if not more valuable than with his arm.
Lastly even when stats are comparable you need to remember just how many of those yards, tds, and first downs generated by Dak are done in garbage time. I’ve seen at least three games this year where Dak finally started to move the ball only after they were down three scores.