COO Family I:
Please note the vest colours. As you can see both Poch figures do have a clearly bright white vest. This is important for the harder to detect Poch version 2.
You can also spot the deeper red to the collar on both.
COO Family III:
The two HK versions differ mainly in the used plastic and their way to degrade. One variants tends to get more reddish limbs the other one tends to get more lighter limbs. Both can be only found this way nowadays. The green colour used to limbs also differs.
The Poch Version 3 shown here is hard to tell in pictures. Next to his Kenner brothers it’s far more easy to detect: Large pupils and usually wider lips. The green tint to the arms and feet is very unique.
COO Family IV:
This COO still only exists in the PBP scared out version. Typically the figure has fat lips, very hard limbs (see the details) and overall a very unique colour combo.
This COO still only exists in the PBP scared out version. On this picture you can see both known Coos compared to a Euro No Coo. Please also note the slight different versions on the PBP Bossk itself. Thanks for the picture to my friend Javier Ruilópez.