correct me if im wrong.
64bit device support backward compatibility.
meaning it will run 32bit app just fine.
im not sure if there are devices that come with 32bit and 64bit simultaneously.
it depend on the chipset and it either come in 32bit or 64bit but not both on the same time.
if your device is 64bit..any game you download will be 64bit automatically to match your device architecture(64bit/Armv8).
unless the game doesnt have 64bit version then it will be download 32bit.
that been said..
all you need to find is the 32bit version apk file of the game.