The 854 Ultramax has a straight down the bowl rinse.
That standard height is 14-5/8" and the "L" ADA version is 16-1/2".
L= 16-1/2"
CEFIONTECT is an option on them. CeFiONtect ceramic glaze
The 604 Ultrmax II has two outlets at the top of the bowl and the two streams of water swirl around the bowl.
The bowl height is 16-18" before the seat is added.
F = 16-1/8" height.
CEFIONTECT is standard with the whites. CeFiONtect ceramic glaze