They are not the same. One has a dark grey (PS1 styled) cable. The other has the light grey (PSOne styled) cable.
So you are specifically referring to
http://vgcollect.com/item/44362?
images removed.
Original image used as "box front" when theflea made the entry was the one with the dark cable.
In March 2016, another user put "cart art" as the one with the gray cable. This was clearly an error because it did not match the original image.
So the Island Blue controller in PlayStation accessory category can now have the art of either the Playstation (black package) or PSOne (gray package) US versions.
None of the 3 sealed examples have the light gray colors. If one with buttons like that and clear blue exists (officially) and was sold either on its own or bundled with something, a new entry can be made for it.
Note: entry was originally added as "Clear Blue" and not Island Blue as it exists today.
For the other two posted as dupes, the "clear blue" or Ocean Blue in PS2 accessory category, we know at least 2 exists there too.
1. Retail release in US, like this:
http://www.ebay.com/itm/1121150109572. bundled with japanese Ocean Blue PS2 SCPH-37000
Maybe someone can find more.
If we cannot find more, then we can surmise not 13 nor 50 people have a Ocean Blue PS2, then we can merge those two entries as a dupe, but then make a new one specifically for the controller that came with the Ocean Blue PS2.