Volvo probably did this just to confuse color blind folks.

There are multiple sets of springs depending on configuration. The NA cars have softer springs than the low pressure turbo. The 'sport' springs are hard as a rock, usually reserved for the R and high-pressure turbos.

You can look at the product plate, bottom right row with 7 digits. The first 2 are the springs/shocks. If it starts with 1, then it is the 35 46 640 spring, 2 = 35 46 641, 3=35 46 642. Each is progressively harder.

I have contemplated swapping springs from a NA to my turbo wagon. Currently, there is zero nose dive when braking, the rear of the wagon never has a load and feels like riding in a go cart without any suspension - really rough. I do not engage in AutoRX, and seldom exceed 80mph, but occasionally like to take a good corner at speed. A tower brace would help.

When I replaced the rear shocks (they were totally dead) because of rotten mounts, the ride was no different. I supposed I could have driven without shocks, unless I put 200lbs in the rear.
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Keeping it running is better than buying new