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There might be more graveminds that we probably have no idea about. In Halo Wars there were graveminds being formed and who knows what other parts of the galaxy have graveminds forming.
I think the gravemind in the main Halo games was probably the most developed and he probably had the knowledge of the others since they all share it.
As for what would happen if two graveminds met I don't really know. I would imagine one would absorb the other since you wouldn't want two self aware graveminds vying for control.