Of course, there is only one Christ.  The issue is that the priest is "an image of Christ."  Does this require the priest to be male?  Absolutely not, because the Word became *flesh* (*human*).  The incarnated masculinity of Jesus is part of God embracing all the limitations of the human condition.  For the redemption, and the sacramental economy, the incarnated masculinity of Jesus is as incidental as the color of his eyes.