Are you looking to do this with usable results, or just as an experiment?

If it's the former - I would say don't bother. If it's the latter, then you already have all the tools you need - starting first and foremost with working on your mimicry chops with your voice.

There is not a static EQ shape that defines a person's character in their voice, it is the dynamic frequency content, syllable to syllable that makes one identifiable over another.

Here's the best analogy I can think of: Think of your mother's voice, quick - describe it to yourself in terms of what frequency content it might have.

Now, think of it over the phone - still identifiable as your mother's voice, but the coupling with the mangled frequency response of the telephone transmission still doesn't take away the base essence of what makes your mother's voice identifiable as her. If you analyzed the direct sound vs. the telephone transmitted sound for frequency content, they would be worlds apart (I've done this in the past).

Yet in your brain, they come from the same source.

Does that make sense why it's not just a static EQ?

First work on mimicing whatever voice it is you are trying to match. That's what actors do.

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