I found a cartridge on Taobao that looks if it were
made by Waixing, and the 'ES' logo is engraved on the bottom of the cart.
This oddity is a 4-in-1 that claims it has 'Plants vs. Zombies', but the box is more of an novelty as it is the original PvZ artwork bordered by the red Famicom label found in authentic japanese titles.
For Gameboy collectors, I found this cartridge that appears to have
Rockman titles, in which I am not sure if this is a compilation of the official Rockman World games, or there could possibly be pirate originals underlying the game.
--EDIT--
I found more info on the Rockman multicart, and it appears to have that Yong Yong Rockman 8 pirate besides the official games. :somari: