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Eibach Pro Kit - Same part number, but different looks. Non-progressive?

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Hi,

I'm a lowering newbie, so forgive my questions, BUT I've just installed the rear Eibach Pro springs (one corner only) on my M3P 12/21 and I have questions :)

1) Comparing the first picture below (which is from a sales add on this forum) with my own springs (third image). The rear springs from the sales add looks progressive and mine does not - even though, they have the exact same part number. Why is that?
2) The only different, I can see (a part from the progressive look) is that mine are marked with J/P and J/Q - whereas the ones from the add is marked with what looks like F/O and F/T. Any idea what these markings means?
3) Can you always visually tell if springs are progressive (by the shorter distance between some of the "layers" of the springs)?

Thanks - any help is really appreciated.

From sales ad:
IMG_6213.PNG

IMG_6214.PNG


My springs:
IMG_6215.jpeg


IMG_6216.jpeg