Steps and Tools to migrate all data from DSM 6.2 in DS412+ to DSM7 in DS923+.

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You can move drives from old NAS to a new one. Make sure you choose the migration option during the setup and not the fresh install.
https://kb.synology.com/en-nz/DSM/tutori..._and_later

DS412+ Intel Atom D2700 Dual Core 4 Yes Cedarview DDR3 1 GB [GROUP 3]
DS923+ AMD Ryzen R1600 Dual Core 4 Yes R1000 DDR4 ECC SODIMM 4 GB [GROUP 3 ]

Migration between different package architectures

1. Package architecture group definitions

Group 1: Armada370, Armada375, Armada38x, ArmadaXP, Comcerto2k
Group 2: Armada37xx, rtd1296
Group 3: Apollolake, Avoton, Braswell, Broadwell, Broadwellnk, Broadwellntbap, Bromolow, Cedarview, Denverton, Geminilake, Grantley, Purley, R1000, V1000, X86