Not VERY different, really, dude. The possession of child porn is a predicative infraction to acts of harm. Also, the creation of the porn requires and encourages acts of harm. The difference, while slight, is there.
Jean, dunno if I'd say he's defending child porn, entirely.
If the someone was accused of Murder, but really should be accused of Manslaughter, it's not defending the act of killing people to properly identify the STILL VERY SERIOUS charge,
Therefore, goes the logic, according to the most ancient and customary of laws the criminals should not benefit from the proceeds of the crime, that is, the sale or use of the pictures.
Using it, reading it, buying it, selling it ~ all contribute to the fact of the original crime against the victim in the pictures.
That is to say, there's a crime and the perpetuation of the crime is part of the crime. And that means there is no difference!