It does perform to the specs, it just depends and how closely the specs were compared with the requirements in the first place.
The new 155B1 has the Arriel 2C2 which improves the OEI continuous power rating. This allows a higher Cat A weight when using the 60 kt Vtoss as the second segment is the limiting factor with the existing 2C1 with its current OEI Continuous power. Still need 580 m reject distance in still air, though.