Though it shared a similar profile with its predecessor, the Nebulon-B2 differed in some key ways. The forward pod split into an inverted-V shape which allowed for greater surface area to mount weaponry; furthermore the connecting spar was heavier, rendering it less vulnerable to being split open by heavy fire, and the ship was about 50 meters shorter overall.
Sublight speed was 17% faster, and shield strength and hull durability were both improved. The Nebulon-B2 was also armed with a concussion missile launcher, which was not normally mounted on its predecessor.
Most of these ships served in the Imperial Navy, although a few ships found their way into the hands of the Rebel Alliance and other groups, probably in the same ways they acquired the original Nebulon-B. At least one of them may have been modified for medical duties.