Thank you for your suggestion. Yes both sports are very similar, in fact some guys from South Korea (who also play Sepak and are connoisseurs of Footbag) sent us a Sepak ball years ago. It was a great gift.
They are very similar sports although with some differences, for example: in Sepak you can use other parts of your body like head, knee and feet, in footbag you can only use your feet, among some other small differences. Both sports are great, if one day I have the chance to travel to Asia I would love to see a Sepak match live.