CST414M is a 15-1/8" high bowl using the more complicated floor mounting, with an open back bowl.
CST416M is a 15-1/8" high bowl with the less complicated floor mounting, the back of the bowl is closed.
CST464MF is a 16-1/8" high bowl, otherwise like the CST416M
CST421MF is a 16-1/8" high bowl, otherwise like the CST416M
M = dual Max flushing
F = 16-1/8" high bowl
CST416M is a 15-1/8" high bowl with the less complicated floor mounting, the back of the bowl is closed.
CST464MF is a 16-1/8" high bowl, otherwise like the CST416M
CST421MF is a 16-1/8" high bowl, otherwise like the CST416M
M = dual Max flushing
F = 16-1/8" high bowl