Quality of NEXT LEVEL PVs from usb and dvd

[Iyreen]

Recently I watching all video clips of NEXT LEVEL's album from the usb version, and I found out the quality is like a bit lower compared from the PV's from the dvd. I was at 1st thinking of copy the PV's to replace those that I already had in my laptop, but now decided not to after watching and compare them.

So issit really the quality of the PV's from the usb is slightly lower than from the dvd?

Sorry if this has been discussed before..