I understand, and don't suggest it is the same thing .The defense presents their case to refute or contest the plaintiff's evidence.
But, the burden of proof still falls to the Prosecution.
They have the responsibility for proving the defendant guilty beyond all reasonable doubt in a criminal trial.
The defense does not have that burden, but can provide evidence as stated above.
They aren't the same thing at all.
IMO.
They do have to introduce evidence if they want to raise a defence of something or someone else caused the death, but not to a BRD standard. Just sufficient to raise a reasonable doubt.