Dab stencil vs Paper: difference?

Can anyone explain to me what the difference is between Dab stencils and Paper?
I don't mean the panels and settings, but the actual effect.

Especially this: what is the difference between:

a] Using a brush with a Grainy subcategory in combination with a certain paper.


b] Using a brush with the dab stencil option in comination with that same paper?

I looks to me that there is no difference.