Micron ratings of compounds don't matter too much for stropping, with some exceptions*. The bigger difference in how they work is determined by the substrate upon which they're loaded, and by the actual TYPE of compond and its appropriateness to the job (determining if the grit is actually capable of cutting the steel effectively). Any 'soft' substrate like leather, fabric or even wood (which is very 'soft' as compared to the compound's hardness itself or the blade steel) tend to make even rather coarse compounds act more like a polisher. And even rather fine compounds, if heavily loaded on some materials like fabric (denim, canvas, linen) can be very aggressive in metal removal (behaving like what we'd assume to be a coarse compound) while still polishing to a high degree (behaving like a finer compound).
* - The exceptions would be in comparisons of directly related compound types (like ALL diamond in a progression). There can and will be obvious differences in metal removal, finish left and polishing speed, and in the fineness of the edge left. But this is really only meaningful if each grit step is comprised of a grit material with essentially identical characteristics (hardness, shape, friability, toughness, etc) and otherwise only varying in grit size.
All the above is to say: The best way to see if a compound is appropriate to your finishing goals is to try it out. Mfrs will never reveal what makes their compounds unique in how they work. Could be differences in average grit size, could be a mix/blend of different types of compound (each with different size, hardness, friability, toughness, shape, etc.) which produce the final result. And the steel being finished - all by itself - will respond differently, depending on its elemental composition, hardness & wear resistance. And trying to account for all those variables to determine (logically) what the finish will be is a fruitless endeavor, most of the time. So don't worry too much about it.
