That's a difference in cost but it doesn't pertain to whether we won/lost.
There's plenty to argue about both conflicts, but to say that Kosovo was "won" in the same sense Iraq was "won" is simply delusional.
If one was won, why wasn't the other? Or maybe you think neither was won (which would be a defensible claim I suppose).
When they aren't shooting at us any more, we've won. When they're still shooting, it's a work in progress and no one has won yet. It ain't rocket surgery.