Will a '73 Continental Mark IV tranny fit into a '74 Swinger with a 318?

He wasn't using the paint to ID anything, just letting me know that they both had the same blue paint. Also sent me pics of the #'s.
Also, I have been trying to figure out what transmission is in this car. 727 or 904? From everything I've read, it appears to be the 904. Would that be correct?
Don't know. You have the car there. Can you get a picture of the transmission pan?