Can't do that as I have heard them in different guitars and it's been years since I heard the Marvins. Also, I have only the middle & neck in my strat, I don't know how the bridge pickup sounds. I'd say the Blues have a fatter (think SRV overdiven neck pickup sound) and are slightly less treblier than the Marvins. The Marvins have extended highs but not piercing highs. Both have an excellent clean sound, if you can afford them you can't go wrong with any of these sets.
This is what sold me on the Blues many years ago, I still have them in my strat http://youtu.be/YmjnBW9IymQ