Stock 340 springs vs comp 901-16

It's easy to work out the spring rates. Take the height differences for the 2 specs, and the pressure difference. Divide the pressure difference by the height difference.

The 901's are around 353 lbs/in (per the data sheets). Per the OP's data above, the OEM's spring rate works out to 335 lbs/in. Not enough difference for the average Joe's use to worry about IMHO. (Unless there is better quality in the older spring wire that holds its rate up better over the long term.)