More pictures.
Top pic, obvious difference in lug size/shape and crown guards. WG on bottom
bottom pic shown how much more meat there is on the right hand side of the PM case than the steel.
I also suspect the pushers on the larger PM case are slightly further from crown than on SS which also enhances the size difference
Pics courtesy of Chardri's great thread here:
https://www.rolexforums.com/showthread.php?t=569589
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Past: 6239 (yes, I know...
), 16610, 16600, 116515, 116613LN, 126600, 126711 CHNR
Present: 16600, 116509, Cartier Santos Green.