There is also the grill array and differences in proximity effect. If you're trying to say they are the same mic that performs the same, sorry, after 40 years of experimenting with vocal mics, we'll have to agree to disagree on that one.

Smart singers would be wise to audition them both and decide for themselves. They most likely will hear and feel a difference, and a 57 with a wind screen might just sound better to them. Many major label heavy hitter singers have specifically requested the 57 over the decades.