While I do agree with FreakieFrog, another thing to consider is geography. KillSpin is used more in Europe, whereas KillerBlast is used more in North America. Just like ball python vs. royal python.

If a super pastel combo contains spider, it is referred to as Killer. If someone said to me "I just hatched out a KillerMojave", I would assume it was a super pastel spider mojave...

That's why a SuperBlast is a super pastel pin, and a KillerBlast is a super pastel spinner...

Chris