Question: two lists trasform using map?

Various transformations on the members of a list can be easily done using things like `+`(op(map(f, L))) for a list L and a function f (e.g., f:=x->x^2 to get sum of squares). How can we do such transformations on two or more lists using map? For example, how do we do most effectively squared sum of differences between the corresponding elements of two lists?

 

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