Underlying the Twin Paradox is the Clock Effect, which says that in a triangle made with future-timelike vectors, say AB,BC,AC, then the inertial trip AC has a longer proper time than the non-inertial trip AB-BC: for elapsed times, AC > AB+BC. This is the "Reverse Triangle inequality".
A spacelike analogue of this would be the ordinary "Triangle inequality" for a triangle with three spacelike vectors, say PQ, QR, PR. The straight path PR is shorter than the piecewise trip PQ-QR: for distances, PR < PQ+QR.
Of course, what makes the Twin Paradox/Clock Effect puzzling is that it conflicts with our everyday common sense notions of time... which could be called the non-"Clock Effect" for a Galilean spacetime... that is, the absoluteness (the path independence) of time. For a triangle with Galilean future-timelike sides, say MN, NP, MP, for elapsed times, MP=MN+NP.