Baja called everything a "ES" back
around 1990, it's just a label thing,
they're all the same.
Just like the 32 Magnum turned into the 32 Caliber,
then to the 32 Outlaw.
Just about every one I've seen is a triple engine
configuration, which to a lot of people now, is
not the most desireable setup, but, due to that,.
they can be had rather cheap.