I’m fairly certain nothing would get canceled out, there would be an equal chance to pass both versions, along with all other primal variations. All primal males can pass all primal variations and (with the exception of ferus) and primal fangs. My smilus king has thrown several basic primals and a felis, but not his own variation. Ferus males and females can pass all variations. The likelihood of getting a variation instead of just basic primal is boosted if you use an the pennyroyal item. There’s also still a high chance of not getting any mutation at all in any breeding involving a primal that’s able to pass their mutation.

This page on the wiki provides more information on primal breeding.

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