No, if you mean polysexual and pansexual.
With poly (many) you could stand on all gender identification, but you don’t have to (only at least 3).
But if you mean “all” instead of “many”, then you choose “omni”.
In the case of pansexual, one is “gender blind”, one has no preferences and is interested in all gender identification.
No, one excludes the other. Polysexuals put an end to one or more specific gender identities, but pansexuals do not. They see the person completely independent of gender / identity.