What's the difference?

What is the difference between Liquid Protien and Protien Drink?

There is no difference; it is simply a matter of terminology as to what the manufacturer wants to name the product.  It is basically a protein formula in a liquid form versus a powder or bar form.  

As far as I know --- it's two different products. Sometimes "liquid protein" refers to those protein bullets & protein drinks are usually shakes. Check the label on the product to be sure you are getting enough. You are free to take either liquid protein or protein drinks. Good luck