Interesting question.
I am not a lawyer but divorce under law in another country was acceptable prior to divorce being legalised here, so on that basis, yes.
The civil partnership bill however does not equate with marriage and grant the same rights as marriage - So a same-sex couple married in Canada where there is no differentiation (as per the KAL case) will only get the partial rights of the civil partnership bill. But a mixed sex marriage performed in Canada will grant full rights here.
And the civil partnership bill will grant no rights to any children being raised by same sex couples - whether or not one parent is the birth parent or not.
This is still up for discussion - but the civil partenrship bill will enshrine in our laws a level of discrimination.