On my current injector housing the input is 1". I think my previous injector housing had a 3/4" input but I used a 3/4" to 1" hose barb adaptor so I could still use the 1" hose.
If it's easy to swap the bits over to make it 3/4" or even 1" then I would probably do so. If you want to experiment and leave it as-is and try it, I would guess that although the smaller input would be somewhat restrictive, it would be not as restrictive as having the smaller diameter hose down all the way to the pump.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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