Captured implies taken from the enemy. These craft were given freely for combat use and were in use. The government controlling them changed, is all. They're not the only example where this happened.
Co-beligerant skins apply, IMO, because they weren't captured. They already had them, they just switched markings when they switched alignment.
No different than, say, going from solid cross above LW wings to just the cross outline. It was a decision to change the markings.