There isn't exactly a difference since there has been some efforts to call the former the latter to focus on the issue of the abuse. If you are wanting to get highly specific with your terms, you'll probably need to work with some definitions stated up front because otherwise people will be assuming layman usage.

Also to note, under current law, those selfies are images of abuse. It may seem absurd that the law considers such an action as abusive, but that is just because the sometimes is absurd.