Are you sure you don't have tha backwards? I could have sworn the SA one was the smaller.well, there are several species of catfish under the name, "bumble bee".
if it's the asian kind, then it's a small, shy and peaceful community fish.
if it's the giant south american kind, then it'll get about 10", territorial and have a voracious appetite.
there are other species, but they're rarely seen.