Difference between BM04B-SRSS-TBT(LF)(SN) & BM04B-SRSS-TB(LF)(SN)

We could explain our customers that the only difference between the following two part numbers is:

BM04B-SRSS-TB(LF)(SN) is on stock and offers NO suction cap for automated assembly whereas

BM04B-SRSS-TBT(LF)(SN) follows exactly the same specification as CONN HEADER SMD 4POS 1mm from JST Sales America Inc. including an ADDITIONAL Pick and Place, Solder Retention suction cap.