Just make the stern use "Wood_Grain_Black" instead of "_Blue", probably. However, if you want to use the same "shade" of black as the hull, you might need to use a different texture.
Ideally we'd rename those textures to use a specific name length, but that would cause chaos with other models using them.
BTW, there's a slight UV mismatch with the FR texture:
Do you think we should scrap the second red stripe instead of adjusting the UVs?
I think that the second stripe is a refreshing change from the other textures in the game. Every Napoleonic or Revolutionary War texture that I can recall is just the standard stripe on the gunports. Then again, I have no idea how long fixing the UV's would take.
Edit: The gold around the gunports looks a little odd. I've never seen anything like that before.