Help identify this crest

[Cygnus]

I'm a bit curious to know why nobody has mentioned that there is a difference between the description in Fairbain and the crest on the badge (aside from only one being gorged).

The reference says it is a "wolf's head couped" and shows one, while the badge is a wolf's head erased.

I apologize for the poor quality of these images, but they illustrate the difference between the two (using boars' heads in this case):

Couped

The head is cut off cleanly in a straight line.

Erased

The head appears to have been torn away.

Is this an important distinction?