You're right they aren't the same, Mahomes has been to the AFC championship game every year as a starter. LOL
Year 1: Brady wins Super Bowl; Mahomes loses AFCCG (vs Brady)
Year 2 - Brady barely misses the playoffs; Mahomes wins Super Bowl
Year 3 - Brady wins Super Bowl; Mahomes loses Super Bowl (vs Brady; not close)
Year 4 - Brady wins Super Bowl; Mahomes loses AFCCG
Year 5 - Brady loses Divisional Round; Mahomes wins Super Bowl
Year 6 - Brady loses AFCCG; Mahomes wins Super Bowl
Year 7 - Brady loses Super Bowl (16-0 reg season); Mahomes loses Super Bowl (blowout loss)
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Year 8 - Brady blows out his knee in game 1
Year 9 - Brady loses Wild Card Round
Year 10 - Brady loses Divisional Round
Year 11 - Brady loses Super Bowl
Year 12 - Brady loses AFCCG
Year 13 - Brady loses AFCCG
Year 14 - Brady wins Super Bowl
Year 15 - Brady loses AFCCG
Year 16 - Brady wins Super Bowl (28-3 comeback)
Year 17 - Brady loses Super Bowl
Year 18 - Brady wins Super Bowl
Year 19 - Brady loses Wild Card Round
Year 20 - Brady wins Super Bowl (vs Mahomes; not close)
Year 21 - Brady loses Divisional Round
Year 22 - Brady loses Wild Card Round
So in their first 7 years, Brady had 3 SB wins, 1 SB loss, 1 AFCCG loss, 1 perfect regular season, and 2 years where the AFCCG wasn't reached; Mahomes has 3 SB wins, 2 SB losses, 2 AFCCG losses, and 0 years where the AFCCG wasn't reached. It is worth noting that 2 of his postseason AFCCG/SB losses were at the hands of Brady himself.
Comparing these 7 years directly, it is fair to say Mahomes has done more. However, Brady has an additional 14 years after that (subtracting the injury year) which contain 4 more SB wins, 2 more SB losses, 3 more AFCCG losses, and only 5 years out of those 14 where the AFCCG/NFCCG wasn't reached.
So it's great and all that Mahomes has reached the AFCCG 7 out of 7 years. But hard to compare against Brady making the AFCCG 14 years total. So Mahomes is only halfway to Brady in AFCCG appearances, and less than halfway in rings. Let's see what he does in his 30s.