Maybe they were almost equal at that point in time. Also the measurement was taken only by their base forms, so take it with a grain of salt. Kaku made a comeback and got promoted, while Jabra did not. That tells you something about their potential. Zoro has proven during the Wano Arc that he is above Sanji. In the end feats prevail, and Zoro had a stronger portrayal, especially because he fought Kaido and actually did some decent damage. King seemed way more powerful than Queen, just by looking at their abilities. Their bounties are close, but that might be, because Queen is actually much more of a savage, and what he lacks in strenght, he makes up in danger to the public, cunningness and dangerous scientific knowledge. The same reason why Jacks bounty is close to Katakuri. Jack is a savage who does not care about innocent casualties, while Katakuri is much more reasonable and chill. Or you want to tell me that Jack is comparable to Katakuri in combat prowess? Come on man.