Per Don@Breja, I actually reversed them. Correct ID would be:
My ID = CTS ID
A1 = 1
A2 = C1
A3 = 2
B1 = 3
B2 = C2
B3 = 4
There's a diagram comparing the CTS to Alpha buried on the StewMac site, but they didn't include it with the rest of the wiring diagrams they sent with the pots. Hopefully this will help anyone else who needs to compare the two companies in the future.
My ID = CTS ID
A1 = 1
A2 = C1
A3 = 2
B1 = 3
B2 = C2
B3 = 4
There's a diagram comparing the CTS to Alpha buried on the StewMac site, but they didn't include it with the rest of the wiring diagrams they sent with the pots. Hopefully this will help anyone else who needs to compare the two companies in the future.