If you buy both small and raise them in groups of 3 or more, I think you may be able to pull it off. Pikes generally hate each other too but when raised in small groups, can occassionally tolerate each other and in some case, loosely school it seems. Make sure the snakes you get are tropical and not temperate though. If they have there own homes they may be alright. Snakes are pretty much the same as pikes in attitude, hunting ability and shape, but I feel like sized pikes are more heavily built then snake heads while juvii, so watch that.