In making the choice for a coil/air spring shock, the behavior of the frame is a big part of the suspension. Is there a ‘list’ of frame progressivity/linearity where one can compare different frames?
an FSR just means it's a 4 bar with a horst link.
it has absolutely nothing to do with it's leverage curve or progressiveness.
You can use linkage software to plot your bikes pivot placement and calculate it's leverage curve, AS and AR etc. just as andre has.
I shared a link to the software in the suspension guide sticky in the general Emtb forum