Ah, thank you for the beautiful pictures - they bring back fond memories of flying the Classic for 12 years!
The NG is supposed to fly fairly similar to the Classic (although most variants are a bit heavier), I am sure you will enjoy it!!
I assume the difference might be like the one between 747-400 and 747-8 (the ones I fly now), they are subtle but noticeable nonetheless.
Good luck and success with your type rating, all the best, Jan