The first is by itself in a hall way. It plays the same sounds as the other droids in TFU. The animations are the same, including the split-in-half destroyed animation.
The second red R2 is found in the
next room. Sitting off to the left, this droid is the target of a Wampa who jumps out of the wall when you enter the room. Timed right, you can grab the Wampa and toss him out of the way. Also in this room is a Yellow R2.