difference between Pandora Box 5 and Pandora Keys 5S

Here's the main physical differences between a Pandora Box 5 and a Pandora's Keys 5S (black with 2 fist). The Pandora Box 5 is lightly bigger than the Pandora's Key 5S. The Pandora Box have a quad core cpu within a blue casing and the Pandora keys 5S have a single core with the board directly in the box (exposed) They don't have the same game list either. The Pandora box have a sdcard for the system in the blue case with a usb key for the roms and the Pandora Keys 5s have only a sdcard for the system and the roms. So I can easily make a backup of the Pandora Keys 5s but not on the Pandora box which have the sdcard in the blue case. The joystick is less loose on the pandora Box, you can hear the difference in the video. That's made harder to play game like tetris on the pandora keys...