Ken I will have to admit here that I don't know what the functional difference of the 2 is. By your description there wouldn't be any. I do know that I can operate 2 single acting remotes with mine. Maybe the other one would allow for a flow through type of operation where one line fed out the fluid and the other one returned the fluid. Just guessing here so don't use that as any kind of solid information. but unless it had a return line to the tractor in adition to the feed line that wouldn't work either. If you figure it out and it is a different animal let us know.