Magazines in China come in Different Sizes

At Chengdu Airport, Sichuan Province, China. Came across with a magazine Psychology in two different sizes, one with standard magazine size, and another, in slightly smaller format. Contents exactly the same. What are they trying to do, could it be that one intends to serve travelers better?
It is amazing to see that exact same contents can come in different form factors. Even at times when Japanese publishers were healthy and profitable, never have I seen such offers.
