I'm with Andrew. I'd suggest unless you're going around a pulley, friction in the system will prevent you hauling anyone of similar body weight.
I had a 10-15kg advantage (sadly) and could just barely haul my partner (who'd fallen off a steep wall below me and couldn't touch rock) by using a Ropeman as a lockoff device around a pulley biner, with a prussic and foot-sling on the downward strand, and pulling upwards on the upward strand.
Usual "YMMV" disclaimer.
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