From what I've read, and I'm not a powerlifter either, the lighter a person is the easier it is to reach 2 or 3 times bodyweight loads;...and to do multiple reps of BW pull-ups etc. Still takes work but is easier. It still comes down to the fact that 2 x 50kg BW is less than 2 x 75kg BW (low BW there but just an example).
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Doh! 
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