The shield will fit any Arduino that takes shields. The 8/10 that you refer to is 8 pins then a gap then 10 pins, right? The two extra pins, if you'd looked, are (well, OK hard to see on the UNO, but a lot clearer on the Leonardo) SDA and SCL (or copies of the TWI pins). They are not used by most shields, and, when they are, are also on A4 and A5.