No mate, well not that noticable anyway, you can tell if the other chap has unplugged cause the pressure builds up slightly but if your working together you should be un plugging roughly at same time anywho. Check this vid out i made it a while ago, with an even cheaper option of the varistream or the like with a tap return back to tank, youll need to send it to full screen.
http://www.youtube.com/watch?v=mJDBuFBUPfw&feature=relatedYou return the water back to the tank so its still pumping out full but not under any strain where as if you just put a tap inline the pump would still be trying to push through, therefore strain and pump breaking etc
You wont need to do this with the tap because you have a varistream in place but you can see the poles working at near enough same flow yeh.
All you need is T piece... £2 odd, and turn your flow up a little to compensate for running 2 poles.