Actually transshipping at sea is petty hard - wave action will impact ships differently and could effectively grind them together, not only ruining your positio

Actually transshipping at sea is petty hard - wave action will impact ships differently and could effectively grind them together, not only ruining your positioning to safely move cargo between ships but also might damage the ships themselves, especially if one of them is significantly bigger than the other. Nothing like this in a free fall environment, so this should be much easier to do in space. As long as there is no atmosphere and the shipscare not insanely big (too many km) or gravity gradient not insanely high (netron stars, etc.).