So both companies made the mistake of sending you isopropanol instead of acetone? Wouldn't that be weird? IPA and acetone both have distinct smells and can be told apart just by whiffing, but in any case, I would try to to apply your suspect acetone/IPA to some plastic that can be harmed by acetone but not IPA.
I remember that acetone readily damages styrofoam (you can even find videos on the internet, whereas IPA does so less readily. Acetone will also readily dissolve cellulose acetate (cigarette filters) whereas IPA may not dissolve it as quickly or it may not dissolve it at all.
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