There will be a stark difference. I agree the D will oftentimes "look" like a 3-4, (sometimes like a 4-3), but up front, you will see a difference in responsibilities especially with our down lineman. Whites defense is constantly attacking with a ton of one gap responsibility. Defensive ends aren't two-gapping. They are shooting gops, running twists and other stunts. At the second level, especially on 2nd and 3rd down, you will most likely see at least one, if not two LB's blitzing.
There will be more big plays given up, but there will also be more instances of the defense getting off the field more efficiently.
Combine that with a more cerebral offense, and for the first time in a while, we won't see our defense gassed by the fourth quarter. Gone are the days of playing corners 12 yards off the ball.
Thank you Lord