On a two handed backhand, the most popular grip style is to use a semiwestern or eastern grip with your left hand and a continental with your right hand, for righties. For lefties, it's the opposite.
When your hands are in this configuration, the racket face will be closed somewhat in the backswing, but with two hand both gripping the racket, you won't have quiet the freedom of movement that you have with one hand on the forehand side.
For righties, if you take your right hand off the handle and prepare like it's a left handed forehand, you can get into a position where the racket face is a little more closed. With both hands gripping the handle it will feel similar to a lefthanded forehand, but you won't have quite the same freedom of movement.