I have Macbook Pro nTB 2017 and this thing get hot as hell when i'm using Premiere or encoding and it is only 15W TDP. Vent is spinning like crazy and i don't want to think what could be with 29 W TDP CPU or even 35W.

Twice the TDP, about twice the cooling (I don't know how heat pipe physics work and if this is linear, but roughly I'd assume). They probably both get similarly hot, it's not necessary that the higher TDP one gets hotter because it also has more cooling.