Well. 1st its not a 1 shoe fits all
On it.. you'll see..drivers for them lights typically are smaller as they don't need a bigger unit for say a 4-500w
Generally, you won't get a led without 1.
They use dif brands. Dif lighting, leds and so on
Yes, they can be used in other lights. But the specs must be right. Or u risk an electrical fault