On the truck launcher two C tubes come in place of one B tube. But there are various possible reasons for that. Like weight. If the clearance is There, there is no reason that ship's vls can't fit in more.
I am more intrigued by the fact the naval variant is shown with a booster, while the land variant was clearly launched without one. Booster is nice to have and may indeed point to an abm role as well for the naval variant . But I still wonder if some vls cells would be populated by a notional booster less hhq9c, which would be more optimized against sea skimming saturation attacks.