Hard Drive replacement

[Enquiries]

Hello, I currently have a DS920+ Nas with 4, 4TB drives, and Synology RAM DDR4-2666 Non-ECC SO-DIMM 4GB (D4NESO-2666-4G) . My RAID configuration is SHR1.

I'm looking to replace/upgrade one of the drives to a 16TB. When I went to purchase I saw 2 different kinds and wanted to insure I get what is compatible with the other 3 remaining drives.

Descriptions:
Current drives - Seagate IronWolf Pro 4TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 128MB Cache for RAID Network Attached Storage, Data Recovery Service – Frustration Free Packaging (ST4000NE001)

Replacement options - Seagate IronWolf Pro 16TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6GB/S 7200 RPM 256MB Cache for Raid Network Attached Storage, Data Recovery Rescue Service

Or
Seagate IronWolf Pro 16TB Enterprise NAS Internal HDD Hard Drive – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage, Rescue Services - FFP g (ST16000NTZ01)

I will eventually replace/upgrade all the remaining drives. Whats the difference and which should I choose to go with in your opinion?

Thanking you in advance