Nick Cannon to Chris Brown -- That's Not a Shoe Collection ... THIS Is a Shoe Collection! (PHOTOS)

Nick Cannon saw Chris Brown's shoe collection and thought "Aww, that's cute" ... and decided to post a few pics of his closets ... on both coasts!

Cannon jokingly called out CB -- who recently showed off his collection. Nick captioned his pic, "@chrisbrownofficial I got stairs and ladders too! LOL! #LACloset BTW my people I'm NOT showing off or bragging by any means, but I have to show young @chrisbrownofficial a lil Sumpn' real quick."

Looks like some of Mariah's shoe game rubbed off on Nick.