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Why there is tiny difference between the TI chips used on USB dongle and KeyFob?

Other Parts Discussed in Thread: CC2540

Hi TI Experts,

We found these on the USB dongle;

CC2540

F256

TI 08J

PLXH G4

        ^

and these on the keyFob,

CC2540

F256

TI 08J

PLXK G4

        ^

We will use this

CC2540

F256

TI 07J

P5R7 G4

I think they all the same but different batch, please confirm, thanks.