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We have both of these species of Calliphora in New Brunswick, Canada; (May 2007)
Can be separated by the cheek colour and as Susan wrote HERE
Susan R Walter wrote:
.................... the enfuscation of the squamae, with the lower one very dark [in vomitaria] with a very narrow very white edge. Vicina has a broad white edge, so this feature can be useful when you don't have such a good view of the face. (Beware loewi and uralensis if in this situation of course.)

EDIT: the above comments were written when I thought one of the flies was vomitoria. The fly is actually Calliphora livida