Citation reference:
https://lifein19x19.com/viewtopic.php?p=246380#p246380Yakago wrote: "Chinese rules with 7.5 komi is equivalent to Japanese/Korean with either 6.5 or 7.5 komi"
You are wrong. Endgame 2 Values provides the theory on pp. 204ff:
"Standard area komi is ...5.5, 7.5, 9.5... Assume standard area komi."
"If the board parity (odd on 19x19) and seki parity (even in most positions with zero or two not scored intersections in sekis) are unequal, the possible area scores are ...-0.5 (smallest white win), 1.5 (smallest black win)... Increasing the komi by 1 does not change the winner."
Therefore, in most games, for the standard area komi 7.5 and the smallest black win 1.5, increasing the komi by 1 to 8.5 does not change the winner with the smallest black win 0.5. For the standard area komi 5.5 and the smallest black win 1.5, increasing the komi by 1 to 6.5 does not change the winner with the smallest black win 0.5. For the standard area komi 7.5 and the smallest white win -0.5, DEcreasing the komi by 1 to 6.5 CHANGES the winner with the smallest black win 0.5.
Hence, it is correct that, in most game scoring positions (with the mentioned parities), area scoring rules (such as Chinese) with 7.5 komi have the same winner as territory scoring rules (such as Japanese / Korean) with 7.5 or 8.5 komi. It is wrong that, in most game scoring positions (with the mentioned parities) and smallest scores, area scoring rules (such as Chinese) with 7.5 komi have the same winner as territory scoring rules (such as Japanese / Korean) with 6.5 komi.
See the book for further related truths of scoring and winner. I speak of truths and not just principles because I have proved the theory mathematically. The proofs fill several pages.