No.  It won't cause a shimmy.  It's possible that one number is a
supersession of the other, or it's possible it's a difference in
appearance, or it's possible it's a difference in width.  

If you've got a shimmy issue, you should start with checking the wheel
balance.  Notify the shop checking the balance that one of the wheels is
different and ask them to report back to you whether they're all the same
width (width measurement is necessary to balance wheels).  If so, don't
sweat the different number.