Yes, it is. It is the EXACT same recording. The mixing and mastering is however different and the WFB release is in stereo, not mono, and as a result of this the Breakthrough release has got much more punch and does indeed sound crisper and "better". But it is the same recording, with Buddy Connor/Conner on vocals on both.
The actual "a-side" on the WFB 45 is by the sounds of it recorded by an entirely different group.