Pink/Red are 40'. Red/Blue are 53'. The 53' containers are probably a little too close together. The gap between the upper and lower 53' containers is to the left of the 2 white squares. The pins are not visible on the 53' containers because the pins are not actually joining the containers at the white boxes, but are inboard slightly. That allows containers like the 40' ones to be attached to them despite 53' and 40' containers being prototypically different in width. On the 40' containers the ring of plastic produces a much larger gap between the containers. Making the thickness of the ring thinner would help the looks of the shorter containers, but might cause a problem in the 53' containers.
