The games are R1 and the cards are PCSE-
ESRB is only required for mainstream US retailers to carry and sell the game. Retro City Rampage was the first release to do this on Vita and vblank cited specifically that the ESRB allowed it. So it wasn't a workaround done in Asia. vblank and LRG are two different companies, and RCR was also extremely limited, so it's not a secret deal either.
LRG has repeatedly cited lower minimum order quantities for PS4 & Vita as the reason they're able to do these releases at all, and are thus far unable to afford to do any releases on other platforms that people ask for due to higher minimum order requirements. So it's probably not being done through a workaround in Asia, or they'd probably employ a similar exploit.