Pantone C and Pantone U looks like the same

Hello all,
Sorry for poor english, and thank you for support.
I am using CS5, Mac (OS 10.6.8)
when I use the color PANTONE, I find out that Both C and U display as the same
but on my colleague CS6, C and U are in great different.
and when he open the file I pass to him, it shows 2 different color for the same pantone code
here are my questions
1. is that a bug or not?
- so is that affect the output?I mean, if it display as very similar, will the output looks very different as a result?
(I mean, if both of us output the same files, will it becomes different?we mostly output as large PDF file for output)
2. is there any method that can make CS5 and CS6 output same color when we output as JPG (RGB)?
Thanks and Best Regards,
Aki

Technically speaking, both Pantone 100C and Pantone 100U would look exactly the same.  The ink formulas are identical.  The only that is different is the paper used on press.  The only reason a "U" is specified is so the prepress people will have plates identified correctly for the type of paper planned on press.
here are my answers
1. is that a bug or not?
- so is that affect the output?I mean, if it display as very similar, will the output looks very different as a result?
(I mean, if both of us output the same files, will it becomes different?we mostly output as large PDF file for output)
No.  It's not a bug.  You both could use different Pantone representative colors or the same Pantone represented colors in your file and they would output the same.  The only difference would be the paper you use.
2. is there any method that can make CS5 and CS6 output same color when we output as JPG (RGB)?
Not enough space here to explain it.  Get Adobe's Print Publishing Guide.  If you output a JPG in RGB, you would have to rasterize the Pantone spot color file and then match specific Pantone colors in Photoshop using the same RGB Working Space, Color Settings, and specific RGB conversion colors in both the CS5 and CS6 versions.

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