Not even the same game. You never leave your ship in Skull and Bones. Also, it's more of a 5 on 5 PvP game. There's no exploration from the video I watched on it.
It makes mention that there will be a single player mode, but how in depth will it be For Honor single player or what?
I will say it is an extremely pretty game. But I don't care for multiplayer focused games all that much.