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I have been wondering about it 4 sum time so can anyone tell me, do they?
Units which can't have different weapons in their regular Army List entry can't have different weapons within the brood when taken Mutable Genus, unless Weaponbeast Mutants are included (Gaunts, Rippers).
Units which can have varying weaponry in their Army List entry can still vary their weaponry even when Mutable Genus (Tyrants, Warriors, Carnifex).
This is clarified in the Tyranid FAQ.
"The meat things seek to destroy ourselves. They hunt us as we hunt them but they are weak and uncertain. The inferior flesh will be entirely destroyed, all biomatter consumed. Ourselves will fight to the last, all weak flesh must be devoured."