Gorilla and some species of brown bear have significant overlap in weight.

(From wikipedia)

Brown bears generally weigh 80 to 600 kg (180 to 1,320 lb), with males outweighing females.[33]

Gorillas are the largest living primates, reaching heights between 1.25 and 1.8 m (4 ft 1 in and 5 ft 11 in), weights between 100 and 270 kg (220 and 600 lb),