they are completely different (though from the same species). blue rams are smaller and far more sensitive to water conditions than the bolivian butterfly rams. the bolivians are a pretty fish too - bear in mind they usually look ugly in pet shops but after a while in the home aquaria, they look awesome.
look at my post in the "show us your south american cichlids" thread, and look for the bolivian rams.
they are really awesome too. males are prettier than females, and get nice long fins. and these fish are really hardy, and even survived a horrible disease outbreak in my tank that killed most of the other fish.s