Shure SM7 internal switchable filters

By looking at the datasheet of the SM7 it makes sense that when the single 240mH inductor is connected, there is low cut. And when the other filter of 11mH in series with 220nF is connected the high frequency response is flat. When no filter is connected the capsule, similaer to SM57, or SM58 manifests its presence peak that the inventor Ernie Seeler did not like. Would an SM58 sound very similar to SM7 if similar band arrenuate filter is used, and similar high pass filter is used?. Attention should be made to the fact that the impedance of the SM7 is 150 ohms whereas of the SM58 is 300ohms or perhaps more. Also one must take into account that rea; inductors have series resistance which is a good thing for example making the slope of the hi pass gentler, and the Q of the resonant filter lower increasing the bandwidth of the band reject filter and arranging the maximum reduction of the peak to be such that a flat frequency responce is obtained. Would it be possible to use variable series resistors for that purpose? The SM7 seems to be a very good microphone if Michael Jackson, Whitney Houston were cutting vocals in the studio with it.