Remo:
I don't know of any graphic pellet ID charts. There are pellet weight charts in the library. Visually, the Wolverines and the JSB Exacts are the same, though. PeakChick, who is an authoritative repository of all air gun knowledge, says they are the same and I believe her.
I have found that you can't always trust the weights posted on the charts in the library, though. For example, the weights of the .20 Beeman lasers given were way off from what I weighed on a couple of tins I bought. This may be a variance in manufacturing, though. I notice that many pellet's packaging will not even list a pellet weight these days.