Right. Based on the photos, I have no doubt that they are Chrysler sourced. What year car is this, anyway?
The "numbers" in the .pdf are the OEM parts as listed in 1972. Mattax is probably using a resource like mine to arrive at his "numbers". What year car is this anyway?
Another possibility is that the springs you have may be Mopar aftermarket. e.g. Mopar Performance or Direct Connection. In my experience, the aftermarket numbers do not usually coincide with OEM numbers even for essentially the same part.