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I dont have Koma yet, but everything I've read suggests that Mejiro and Koma are different. In my mind, the logic goes like this. People have omitted Koma and I've been honing without it for years. I...

For me, using Tenjyou and Mejiro - in that order - is absolutely necessary. Tenjyou is the coarser stone, so it comes after Botan. As mentioned, there are no easy rules with naturals, just gotta try.