The aqua Cuddles does discolour fairly easily to a greenish hue, but the two pictured above are different production runs - note the variation in black (brown-black and true black), sclera size and blush placement/intensity. The aqua HK is much more common than the blue China. If the blue got a NA release, it was likely MO only - I've only ever come across the aqua 'in the wild', and she's up there in common-ness with Cotton Candy and Peachy.