yes. the 2nd one seems to be an oem card?
normally all cards have stock 200/166.
it's the same with various gtx280 cards. there do exist a lot of "superclocked", "overclocked" or "extreme edition" versions of those cards with slighty different clocks to the standard ones.
we also can't add here 10 different categories because the clocks are 10mhz off or so.
i hope you know what i mean.