Verdict

Both are comparable SSDs. The ZA4000NM1A002 is rated for more write endurance than the SB-RKT5-4TB, so it's the longer-lasting choice for a NAS that sees steady writes; for light use either is fine and price decides.

SB-RKT5-4TB ZA4000NM1A002
Capacity 4 TB 4 TB
Form factor M.2 2.5
Interface NVMe SATA
NAND type TLC TLC
Endurance (TBW) 3,000 TB 5,600 TB
DWPD - 0.7
DRAM cache Yes Yes
Power-loss protection No No
Sustained write - -
Price / TB $239.71 -

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB uses the cheapest live price where available.