Yes.
If you're not careful you'll touch the edge of the backing plate into the paint or some component on the car and either scratch the paint or mar or scuff the component.
How important is your car to you?
How strong are you as far as being able to always be in control of the polisher as to not ram the backing plate into anything?
You're call, use what you have and be careful and accept any risk or wait till you can get the right size backing plate.

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