On the StackExchange sites you can click on any user and see the number of up and down votes they've placed.
On Area 51 you can't.
Why is that?
See follow up question: Area 51 should also display up and down votes per person
It's on a slightly different code base.
It was forked a while back to allow for "not a good example" or "meh" votes as well as the usual "up" and "down" which had been re-purposed for "great on topic" and "great off topic" votes along with a few other changes which I can't remember right now.
This means that changes made on the main code line aren't reflected on Area 51 and vice versa.