Sometimes they're the same thing--but sometimes I think setting up a self-correction at a low level is important to prevent something that would be harmful. For example, when you put electric fences up to keep deer out of the garden, you put bits of apple or peanut butter on the fence so the deer noses it, when she's calm, standing still, and not panicked. She gets a correction from the fence, and she learns to stay away from it. If you don't do this, she can smash into the electric fence when she's running and hasn't learned that it's hot, and she can end up horribly entangled. Much better to set up a milder self-correction to teach the necessary protective behavior in a controlled situation.
I did something similar when training my dog to respect the neighbor's electric fences. They were set at a cattle charge, and I didn't want him to touch them and get shocked at that high a charge. So I put a much lower stim electric collar on him, and then put a hunk of steak under the fence. He went over to get the steak, and I stimmed him at a medium level, BEFORE he hit the hot wire (which would have been about 1000 times the shock level I used on the collar, I'm told.) This taught him to stay away from those fences without him needing to get a cattle-level shock. Yes, I did set him up to fail, but this prevented a much more painful lesson: cow fences HURT.
Of course, I could have kept him on a leash for years, but for this particular dog, that would be a lot more aversive than learning to respect the neighbor's fences.