macOS 12.3.1 (21E258) for MacBook Pro (M1 Pro, 16-inch, 2021)

Identifier: MacBookPro18,1
Board 1
BoardConfig: J316sAP
Platform: t6000
BDID: 0xA
CPID: 0x6000

macOS 12.3 (21E230) for MacBook Pro (M1 Pro, 16-inch, 2021)

macOS 12.2.1 (21D62) for MacBook Pro (M1 Pro, 16-inch, 2021)