Say, the Beforus trolls' lusii had the same name as the Alternia troll's lusii, correct? Such as Meulin and Nepeta both having Pounce.

All but Kankri and Karkat and Meenah and Feferi had the same lusus. Feferi’s lusus only existed post-scratch so Meenah had a different one. Kankri was obviously a mutant so he didn’t have a lusus.