Which schematic is the SM57 / SM7b?

The Sm57 has a bit more top end. To my ears the SM7b sounds 'smoother' than my SM57's. For vocals I'd always choose the SM7b over the SM57. For micing a guitar cab the SM57 would be my choice over the SM7b, but not other dynamics I have. The frequency shaping switches in the SM7b are handy occasionally. I wouldn't miss my SM57's if they were gone.
Still cant go wrong getting SM57/58, SM7b...imo. .if nothing else they are a "true icon studio standard" to compare to.
Kind of like LDC's get compared to the Neumann U87 standard, or a U47 for the tube heads...under attack, with clones and drones...
I did some homegrown 57,58,7b tests like 10 million others and I didnt hear a lot of difference. I beat the dead horse a bit, it was new to me then.
Also understand the "the 7b dark blah comments" , "it sounds like a blanket is over 7B"?
But the SM7b has that placebo of Thriller, LosLonleyBoys, Sheryl Crow and Metallica... billboard charts... and proven it can work really well, by the pro's on big albums ? !!
...so then I blame myself as the problem or my ears are off that day, who knows? lol.
With LDC's I couldnt afford the Neumann "standards", but Ive done a bunch of them in this closet studio and really came to think with some eq, a solid preamp theres a whole bunch of mics to choose from. Some budget mics have made the Billboard charts too...Matt Wallace MXL990, Billie&Finn with AT2020 and 5 grammys, Adele with RODE, probably a long list these days.