sir..i hope naka tabang ni nimo...

if were talking about the mature or maski sub adult pa na size of both Ts, mura pareho cla tanawun..but if you're going to look closely, naa jud difference...although they're both brazilian sps....the best basis of this one is...the carapace color...
i believe that N. chromatus has a light (white) carapace compared sa A. geniculata na dark(black or brown )carapace..
another is ...if your going to look at jud ang hair colors nila sa abdomen, ang sa chromatus, reddish jud na mura pinkish na.....compared sa geniculata na mura ra fire orange ang color...
im not that very good in this..just an obsevation lng..hehe...and sa 4-up" ra na size..
Brazilian Red and White (chromatus).......Brazilian White knee(geniculata)....and i believe they're both Birdeaters...
Makalibog jud sometimes..
