it is a similar missile with advanced range and bigger war head.
To the extent that all anti-ship missiles all share some characteristics, you are absolutely right.
MM38 Exocet (rocket motor)
Dimensions 4.7m x 0.35m (1.0m span), Missile weight 670kg, Warhead 165kg, range 38-42km
MM40 Block 2 Exocet (rocket motor)
Dimensions 5.2m x 0.35m (1.0m span), Missile weight 735kg, Warhead 165kg, range 72km
MM40 Block 3 Exocet (airbreathing turbojet)
Dimensions 5.2m x 0.35m (1.0m span), Missile weight 735kg, Warhead 165kg, range 180km
C-602 (export)
Length 6.1m (without booster); 7m (with booster)
Missile weight 1,140kg (without booster); 1,350kg (with booster)
Warhead 300kg, Range 280 km