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I also went through all the maps in the UI 1.2 and reduced their ed_map01.tga ed_map02.tga map_F.tga ...by changing them in Photoshop from RGB colour to Indexed colour ....this reduces them in size to 1/3rd of their original size
This map's ed_map01 goes from 116mb. to 29mb.

Maybe I misunderstood your post, but I am always curious about new things. However, I looked through some of the maps but never saw the first two files you listed (ed_map01.tga ed_map02.tga).

In the 3BG_KTO map, I did see ed_m01.tga and ed_m02.tga, but not the ones you listed. I converted these to Indexed, but then the map would not load in the FMB.

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