It depends on how you plumb them. If you use a 1.5" Y fitting the in turn goes to 2 more 1.5" Y fittings and then at the last point goes to 1" returns I think it wouldn't lose much head pressure.
However if you just go straight out of the pump to a 1.5" pipe with 4 - 1" T's coming off it that will eat up some head making the turn into the 1" pipe. Not a tremendous amount but anytime you narrow it down to 1" it is going to create more friction.
Either way isn't going to be as bad as going straight to a 1" pipe right off the output which reduces water flow 40% per dolphin pumps site.
FWIW, Nathan



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