Concept artist's DeviantArt account. https://www.deviantart.com/heavymetaldesigner>>7742740
Yeah they're in Ko-Wahi, and the reason they're more set accurate than all other characters is cause they were the first models made for the movie. Supposedly they were meant to be animated and have a bigger role before the script was finalized. Otherwise I doubt they would have gone through the trouble of modeling them so meticulously for a few second cameo.
The fire drones in Vakama's workshop from the 2nd film also reused the Bohrok body models with nondescript Matoran heads.