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We struggled with this because the activation process is clearly one command then another, and exchange of places is a difficult activation which affects the activation score of both units. There is no mechanism for dealing with an activation involving multiple commands (what would happen, for example, if the activation failed). Equally, as non-light units, an exchange cannot be by one unit interpenetrating the other.
We eventually decided that the exchange wasn't possible at all. Either the front unit had to use an activation (when its command was activated) to move forward to get out of the way or the rear unit had to move backwards out of the box and then find a differnet way forward. Was this right?