User blog comment:BannedLagiacrus/Monster Appreciation Week: Blangonga (4th Gen)/@comment-26516708-20161002064852/@comment-5020152-20161002132624

Guess that makes Rathian a Rathalos rip-off.

Seriously, though. Blangonga and Rajang look similar, but their movesets are completely different. Blangonga has one breath attack, can dig underground, is able to summon minions, jumps around more often, et cetera. Rajang focuses more on shooting lightning and punching the sh*t out of you. They might have the same model, but they're different monsters.