I don't think it will survive sad but true just the mouth there is no way it could grab a nipple and feed. If a kitten with a clef lip could have problems nursing and die so would a two faced kitten with a joined mouth like this. Here's a link to the poor things story.
http://www.oregonnews.com/article/20050616/BLOG/50616019&SearchID=73211536441087
http://www.oregonnews.com/article/20050616/BLOG/50616019&SearchID=73211536441087