I assume you are referring to beauty products?
A body mask/masque is usually a cream or paste applied to the body for some beauty purpose. For example, a moisturizing body mask/masque is used to moisturize your body skin.
A body wrap is usually a wrap made up of plastic (or cloth) used for weight loss purposes or to seal in a cream/paste applied beforehand so that it can be better absorbed.
However, body wraps can also refer to body masks/masques that can be peeled off after drying.
And take note that "mask/masque" can refer to either masks made of thin cloth-like paper, or creams/pastes. I personally feel that "mask" should be used for the ones made of thin cloth-like paper, and "masque" should be used for creams and pastes. But it seems the beauty industry does not make a clear distinction between the two.