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I reflashed my 2000 O.S. to a 2002 using EFILive. I believe you can do that to a 99 as well. 2003's and above need a different PCM altogether I'm pretty sure.
99-00 and 01-02 are the same ECM, but the parameters in the program are different. You can rewrite a 99 to an 02 though. Pin wise they are the same, the 99-02.