Gold dojo and normal weather loach are similar species.
Both "versions" have have been very entertaining and hardy fish in my experience, however the "grey version" goes for $5, while the equally plentiful "gold version" fetches $10 a pop.
In a related note, I was in my LFS last night with the intention of checking out his Khuli's and while browsing I noticed a single butterfly loach in a tank of Danios. And, at the same price as his other loaches ($5) I couldnt pass him up. He's about the size of a penny and is no stranger to the veggie rounds I drop in at night before bedtime.
