Whats the difference with these shock kits?

[BiG K]

Dampers are rated for the car's weight, so there'll be different damper ratings depending on the engine and body type (hatchback / cabbie / estate).

Then around 1997, Peugeot changed the specification for their dampers.

If all that isn't confusing enough, places like Argentina etc where the road surfaces are VERY poor, there was a different damper set which increased ground clearance lol