PMS RGB Values Different in Illustrator & PhotoShop

Hello, Forum;
I'm stumped here. I'm working on a project that has me going back & forth between PhotoShop & Illustrator, working in PMS color. I've noticed that the RGB values for a given PMS are significantly different between the two environments. For instance, PMS 383C in AI is
R:178
G:187
B:30,
where the same 383C in PS is shown as
R:162
G:173
B:0
Why would that be?
Thanks.
Cayce

see here:
http://rwillustrator.blogspot.com/2007/02/busting-myth-achieving-consistent-color.html

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