The SCXI-1321 terminal block was built for use with the SCXI-1121 module. Since the input connectors for the SCXI-1122 and the SCXI-1121 are different, you won't be able to use the SCXI-1321 with the SCXI-1122.
So, you're right, you will need the SCXI-1322 terminal block with the SCXI-1122.
Let me know if you have any additional questions. Have a great day.
Regards,
Todd D.
NI Applications Engineer