Comparing vector graphics with one another

What is "vectors match 90%" or whatever even meant to be? Area covered? Maximum amount of deviaton? Exact topology? Realtive fitting? Does it need to be a certain probability or an exact number? I'm afraid unless you can provide a clearer picture what the actual purpose of the whole exercise is supposed to be this won't be going anywhere. What you're asking is basically to create an OCR/ shape recognition algorithm in a script and aside from potentially being slow the complexity could be enormous depending on which criteria need to be checked. At the end of the day, unless you need to do this for hundreds and thousands of shapes just sorting them visually yourself may be much simpler. Otherwise I'm pretty sure this is more of a case of creating an actual plug-in or using existing libraries for Python, Java or C++ to implement such functions.

Mylenium

Explain a bit more in detail, please. Perhaps with a few examples?