The N50 has a “non standard” (for naim) input capacitance of only 100pF.
The 222 has 470pF, much like Stageline N and SN3.
So not the same.
The N50 will have far wider cartridge compatibility, based on cartridge manufacturer recommendations.
The difference 470/100 input capacitance makes is noticeable, but can’t discuss how we know this on the forum.