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If I understand the question correctly, Thunderbolts, Marauders, Lightnings, Valkyries etc would likely remain in their respective Imperial Navy colors, as it would be very unusual (and possibly heretical) for a Space Marine Chapter to formally incorporate those units into their command structure. A Space Marine Captain or Chapter Master could emerge as the head of a military operation that includes fighter and bomber squadrons, giving him command over them (thereby allowing them to be temporarily attached to a Battle Barge, for example), but those Navy units would retain their own organization and chain of command.
With that said, there are campaign and army badges that are used by the Imperium to signify units common to a certain theater. This could be an opportunity for you if you're looking for visual consistency. For example, maybe a Thunderbolt is in its traditional Navy colors (camouflage, blue, grey, whatever) but carries a blue and gold stripe to identify that it's attached to an Ultramarines Strike Cruiser. This would allow for a bit of visual diversity within your display (given that the designs are very different from Space Marine blockiness, they'll stand out anyways, it may do well to emphasize that with color schemes), while still retaining a sense of cohesion through painting stripes on the wing, maybe the cockpit assembly, the tail, etc of the aircraft with those markings.
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