check the bums. If they're the same then they're both males
thing with males is that there's a dominance issue, so the one chasing is probably the leader over the one being chased. you have to watch out then that the weaker one gets proper food and he doesn't get bullied out of his share of meals and veggies. Also make sure he doesn't get insured or gets sad. If he does you might have to sepparate them.
picture below is of a male
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