Well, first of all White doesn't necessarily want to play e2-e4 in the Fianchetto KID at all. It blocks the bishop, gives Black a target, and loses pawn control of d3,d4,f3, and (not that it usually matters) f4. Often White will at least delay the move until Black is actually threatening something. And if you aren't going to play e4 early, why play Nc3? The reason 3.Nc3 is a thing is to play 4. e4. If you aren't going to play e4, maybe this can be delayed too.
On the other hand, if you're planning to fianchetto, then c4, g3, Bg2, and 0-0 are always going to be things you do. Unless you're playing the English, you want d4 too. And while I've seen people delay the king's knight's development to go to e2, this doesn't seem sensible (g3 isn't available for one thing). So, unless Black is threatening something, White should play the most flexible moves consistent with his plan.
1. d4, 2. c4, 3. Nf3, 4. g3, 5. Bg2, 6. 0-0 (in some order).