Z4 M Springs on Z4 Non-M

[Spec-Al]

Does anyone know if the springs are interchangeable? I did search but didn't see this, guessing because it either doesn't fit or no one has tried. Obviously the stock Z4 non M shocks won't be valved for the Z4 M springs, but it does seem that the Z4 M springs are taller than Z4 non M w/ M sport suspension. Looking for a setup that isn't lower than Z4 non M w/ M sport with a stiffer spring rate. Most coilovers seem to be set up to drop.

[Spec-Al]

Did a little bit of research this morning. Visually the M/non M springs appear similar. Real OEM shows that the upper and lower rear spring pads are the same part number between M/non M, which leads me to believe they'll physically fit. Front however, while the lower spring perch is the same, the upper is different. The entire top mount of the M is different, but may not be interchangeable because the strut shaft diameters probably are not the same. I guess long story short is, unless someone has had both sets of parts in front of them, difficult to say what fits.

[Yapakanichi]

You'll probably need the offset lollipops, upper spring perches, and springs. The rears would probably work, just the shocks are probably different