Probably too different, as snails are benthic, while ammonites where probably nektonic.
Iirc the shells being longer is something about allowing gases in the shell to compress or expand as needed to control bouyancy. I would imagine there is a sac of gas, and the ammonites would siphon water in or out as needed to compress or decompress the gas.
Edit: just looked it up on Wikipedia, it appears the heteromorph ammonites are thought to have maybe been planktonic or benthic.
Definitions for non-nerds:
Benthic means living on or near the sea floor.
Nektonic means free swimming
Planktonic means going with the current as plankton. I should note plankton aren’t all tiny, some are visibile to the naked eye. All it means is unable to propel themselves against current.