In my previous post I showed the frequency response of each mic which is far from identical...so no I am not saying they are the same mic or that they perform the same.
However, the polar response at the tested frequencies appears to be essentially identical. If there is significant variation in the polar response between these two mics, it is at frequencies that were not tested.
I make no other claims, and if you prefer to sing into an SM57 with a windscreen I have no argument with your choice. Hopefully your choice is based on the mic's performance on a bandstand working with an actual band, rather than singing by yourself through headphones, which is how many vocalists choose a mic.
I don't own any SM57s, and I don't plan to use my SM58s unless somebody really special comes along and throws a tantrum. I have several vocal mics that I consider way better, but I totally understand that someone who has been singing on a SM57 or SM58 for decades will struggle with a modern hyper-card or super-card mic, because it's necessary to drastically modify your mic technique...and that's exactly why I keep SM58s on hand.