Why do i have apple_HFS on /dev/disk0s2 and apple_HFS macintosh hd on dev/disk1? is this normal? coz they're exactly the same partition

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *750.2 GB   disk0
   1:      EFI                                                      209.7 MB   disk0s1
   2:      Apple_HFS                                          498.0 GB   disk0s2
   3:      Apple_Boot Recovery HD                      650.0 MB   disk0s3
   4:      Microsoft Basic Data BOOTCAMP         251.3 GB   disk0s4
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *498.0 GB   disk1

I have the same question for my iMac. I guest it is a logic drive that allows us to run very large drive without breaking the boot recovery. I notice my Macbook Pro doesn't have it since it has a much smaller drive.

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