There are no "differences" but some crankbaits are not suitable for trolling. The colors that "I" like are Gold Flash, Purple Virgin and Firetiger. And, I am sure that no matter what, photos don't always show the true colors... So, the one that might be Silver and Black would also be good. For lots of the impoundments of the Wisconsin River that are dark to very dark stained water that Gold (any gold is my 1st choice to try) would be my choice. The White for muddy river conditions on sunny days...
But, I am very interested in the "action" with that tail. Lots of time pulling cranks we have better luck with jointed shad raps or jointed Rapalas so any two piece bait is of interest.
Tom Keenan (and his brother and nephews) have forgotten more about catching walleyes than I have ever known. I attend any seminar he gives and a lot of what I do has been the result of his suggestions. He likes to K.I.S.S. and is not in the have to have and use the latest and greatest... so if he is adding something to his arsenal (and he has a lot of integrity to avoid temptation) it just might be worth jumping on board.
Pat Neu is a well recognized expert at trolling cranks, so he too is an impressive name on that list. Same story as Tom Keenan to some extent. He uses very few selected baits. So, if he too is adding something he impresses me.