Sort of... Salsa's "slow" tends to be more of a progressive forward or back action, or even a closing of the feet. Rumba's basic is stright to the side (or side & slightly back when turning).
To see a Rumba Basic in action, visit the new Rumba section at www.ballroomdancers.com/Dances/Dances.asp. There are a few video clips of the basic, complete with instruction.
Sincerely,
Jonathan Atkinson
www.ballroomdancers.com