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I checked the original files and the ships are not layered, so the coloured part is not separate. It's possible through photoshop to extract the coloured parts and save them separately. But this loses some of the subtle detail in the coloured sections, so the result doesn't look as good as the hue shift mechanism I mentioned in my earlier reply.

If you're familiar with photoshop (though I assume most graphics software packages offer something similar), you'd be recreating the 'hue/saturation' effect, in Krita it's called 'HSV/HSL Adjustment'. See attached image.

May I see one of the ships (just the ship so that it’s not blurred by how small it is in a screenshot)? I would like to know if the contrast between the greys and the colours is enough so that I can easily separate them by colour.

The image in my previous post was full size. Right-click it and choose 'show image' or similar depending on your browser. Red are the original images.

Attached are a few green ones as png.