I’m sure they went on right, they come in different boxes properly labelled, so I would have had to make a positive effort to mix them up. Springs and shocks are packaged together.
I recently replaced the 2" lift shocks and spring (front and back) on my 1991 200tdi with the new Terrafirma units. The old units had done 100,000 miles and I had obviously slowly got used to the idea that the shocks had no bounce to them. And...