does air asia and air asia x have the same baggage policy?

i'm a frequent air asia traveller and all the time i carry a slightly oversized backpack (those backpacking type) as my carryon. while it does not fit the regulation dimensions, there is no problem slotting in the bag straight in at the overhead compartment.

never had a problem with air asia or mas. now i ll be flying first time with air asia x, will they be strict?