I did not check what version of Illustrator you are using, but it looks like an old version (or at least the document you are using comes from a CS5 or earlier version). C9, M0, Y43, K38 are the old values as Pantone used to give (and they changed them in Color Bridge) These were fixed values. Newer version of Illustrator use the Lab values and color management and will give you even different conversions: In Europe Pantone 5773 will give C 47,73, M 30,59, Y 64,24 and K 13,96%
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