All the PSR's I've had will use any momentary action footpedal (i.e. one that reverts to its rest condition when you take your foot off)(as opposed to a switch action as is sometime necessary for effects units when the switch goes off-on on hte first press and on-off at the second) of either action (i.e. normally open or normally closed) to operate in either of the available footpedals (just alter foot pedal polarity to suite). Anything described as a "sustain pedal" will be fine.

Therefore I'm sure the 740 footswitch will work fine.

And I've bought a 128m Smartmedia card for my shiny new 3k!