I have just bought a Samsung Tab 2 10.1. I downloaded a manual and found it was for GT-P5113. I have the GT-P5110 version. At the time of purchase I did not know there were 2 versions other a 3g and a wifi.
The difference I have found is that the GT-P5110 does not have the "Smart remot"e that you can use on your television/video/dvd player. Also I have noticed that in my version there are some apps missing.