Actually 3397273B is the same as 3397273. Whirlpool sometimes adds a letter to the end of a part number, but this does not make the part any different. So 3397273=3397273B as per Whirlpool, in fact the box itself should just say 3397273, even though the timer label will have the letter B on the end.
Dbaker, don't re-use the jumper wire. Connect all other wires as is on the old timer.
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