What is the difference between M1BXA-1640K and M1BXK-1640K

No difference can be found in selection table. part no. Differs in the 5th place but what does it mean.

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These are value-added cables which means we assemble them in house. There are different connector receptacles on each one. That is why the different part numbers.

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Part number M1BXK-1640K-ND uses these parts for the assembly:

M1BXA-1640K uses thes parts:
Assembly Component

PART NO. DESCRIPTION QUANTITY
3448-89116 STRAIN RELIEF 16 POS IDC SOCKET 1
1700/16 100SF CBL RIBN 16COND TWIST-PAIR 100’ 1
89116-0001 CONN RCPT 16P IDC 26-28AWG GOLD 1