It doesn't just make a huge difference - it's a different thing entirely. Credit where credit is due, initially and up front, is being honest. Changing it after and pretending like it was like that the whole time is trying to cover up your own actions - that's arguably even worse than the initial plagarism. (At best it shows the same underhanded streak as the plagarism itself.)

Completely despicable. Added TNW to my hosts file.