1. We are different, but same,too.

2. We are different, but the same, too.

(Which one is correct?)

#. Cash or charge?
(What is the full form of this expression which a clerk says at a shop?)

#2 is correct.

#3 is short for something like this: "Will you be paying by cash or charging your credit card?" I'm sure you can see why clerks just ask, "Cash or charge?" right?? =)