I’ve watched a dozen youtube videos and I still cant understand how a jake brake is any different than regular engine braking

I get that the exhaust valve opens up twice per four cycle versus just once, but I still don’t understand how this changes anything.

Typical engine breaking slows down a car because the pressure of constantly pulling a vacuum puts load on the motor and slows the drivetrain down

But I don’t understand why opening the exhaust valve after pulling the vacuum slows the engine out even more?

How is that any different than just engine breaking in general?