Hot Toys TT are MASSIVE compared to Gohs. If 1/6 scale guys came in sizes I'd put a Goh at Medium, just under DML, and the True Type as a 1x. They can't really share clothes, unless the Goh wants a baggy shirt, but the TT can fit enough of the "Dragon" size.
And I did a patten book that covers all sorts of guys if any of yours are nekked...