Scarf's equivalence between distance and climb is an extension of Naismith's rule.
https://en.wikipedia.org/wiki/Naismith%27s_rule
I.e. what would the equivalent distance be if it was flat?
So in descending order of km (sorry imperial folk!) this gives us the following...
Wasdale 55.8
Darren Holloway 55.4
Ennerdale 54.9
OCR 53.4
Duddon 43.5
TWA 42.9
Borrowdale 42.8
Great Lakes 37.9
Obviously it still doesn't take into account terrain nor as Mark has pointed out, by the time you start the climb of Great Gable the wheels are already starting to come off but at least gives a reasonably reliable comparison
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