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Everyone is making this way too complicated. ICC profiles are simple and the key. You simply need two profiles. One for their process, one for yours. Doesn't matter if it's RGB or CMYK (although CMYK to CMYK does bring up some possible black generation issues). A Device Link can help a great deal but the bottom line is we need to know how two completely different devices behave and need specific RGB or CMYK numbers for each. If you have that, color space conversions with the proper intent and a bit of massaging will get the match a good 90%-95% assuming the papers are not totally dissimilar.
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Also assuming that the print in question come from a stable/repeatable output device. I've gotten photographer's "client approved" prints for us to match that were so unlinear that a Y20 patch was denser by far than a Y20 C10 M10 patch. Nightmare prints, but the client thought they looked pretty. Attempting to match those prooved only marginally successful.
