Take ETH/ETC, if you had ETH when there block chain forked, you had just as many ETC. This is almost the same.
It is actually not even remotely the same, for better or worse. Giving equal amounts to near-dust as large balances enormously changes the distribution.
In the sense of being a snapshot of a single block, I would assume that part is correct but I wasn't around and haven't looked closely so I can't be sure.