Resurrecting an old thread, I know, but...
Here's my only issue with calling them the same:
Although breeding a lesser to a butter WILL give you a BEL, if you breed that BEL to a normal, you still have a 25% chance of producing a normal...which means the BEL you have is NOT a super.
If you produce a super butter BEL, you have 0% chance of producing a normal with it's offspring.
Compatible, and very similar- but not the same.
This is incorrect. A BEL no matter how it is created will produce all morph babies, no normals.