They are the same entity. Both when it comes to the
franchise that they represent, and the
character.
Ghostly Adventures Pac-Man is as close to the
World Pac-Man as the
Classic Pac-Man is to the World one. The only difference is that the character has been reworked in personality and canon...again.
"Toru Iwatani: Pac Man’s character is difficult to explain even to the Japanese–he is an innocent character. He hasn’t been educated to discern between good and evil. He acts more like a small child than a grown-up person. Think of him as a child learning in the course of his daily activities. If someone tells him guns are evil, he would be the type to rush out and eat guns. But he would most probably eat any gun, even the pistols of policemen who need them. He’s indiscriminate because he’s naive. But he learns from experience that some people, like policemen, should have pistols and that he can’t eat just any pistol in sight."
This was his personality at first. But the Hanna Barbera cartoon, Pac-Man World 3, and Pac-Man and the Ghostly Adventures all have vastly different personalities from one another, and also all have different designs.
Along with that, non-Ghostly Adventures designs are being used
even today. Pac-Man Monsters was released only four months ago. If that design's not close enough, then keep in mind that the typical World design was itself used only
two years ago.
That makes this design of Pac-Man
if it is a separate entity less retro than
Other M's Samus.
I just explained above with Pac-Man, but even the design that Mega Man uses in Smash was used last
March 1, 2010. Which is only about six months before Metroid: Other M. Seriously, look it up. If we're counting Mega Man (who was used last before World Pac-Man was) as our retro, then Ridley, King K. Rool, and Isaac would all be retro as well, with the King being the greatest offender, showing up last in 2008.
So, no, we do not have a retro right now. Neither of the third parties count even without arguing the Nintendo point. Neither of them fit the age criteria.
And before you argue Little Mac, his last game was
May 18, 2009. And
Nintendo themselves have on the website for that game that
"Little Mac is back!!". So, not retro.
TL:DR, known better for older games =/= retro, redesigns are not different characters, and King K. Rool is more retro than Pac-Man, Mega Man, or Little Mac.