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The order can actually be found in the RotgB Bestiary, in the Options tab in the spawn menu. In brief, the order is:
Red, Blue, Green, Yellow, Pink,
Black / White / Purple / Orange (they have the same RBE),
Gray / Zebra / Aqua / Error (same case),
Rainbow, Ceramic, Brick, Marble, Blue Blimp, Red Blimp, Green Blimp, Monochrome Blimp, Purple Blimp, Magenta Blimp, Rainbow Blimp.
Yeah, the order is slightly different. I should mention that Monochrome gBlimps have a lower RBE than Red gBlimps, but are Camo-Lead themselves and yield Fortified Camo Regen Marble gBalloons, which can be very deadly. Similarly, Magenta gBlimps have a lower RBE than Green gBlimps but move at ridiculous speeds and ignore damage that deals less than 15 layers of damage.
Hope this answers the question.