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CC2640R2F: CC2640R2F Differences in Top marking

Part Number: CC2640R2F
Other Parts Discussed in Thread: CC2640

Dear TI experts,

There is a difference between the latest CC2640 received by the customer and the one received before in the silk screen, as shown below, are Ax2L and ANSF different factory codes? Is the top marking different because it comes from different factories? Many thanks!