Photoshop :: CMYK Colors Appearing Slightly Different In CS6?

Photoshop 5, (not CS5, but version 5). I was using it on a Windows XP computer, but my new computer, running on Windows 7, would not run Photoshop 5. So, I bought CS6.

There's one problem. I use Photoshop primarily for coloring comics. Which means I create images in CMYK color. And I'm noticing a slight difference in certain colors in this new version. Most noticeably, in a color combo I use for coloring average "Caucasian Flesh".
 
My settings for this shade would normally be:

C-3
M-25
Y-25
K-0
 
This, in the old version of  Photoshop, would produce a pretty average "beige" color. However, when I use this same color setting in the new version, the shade is noticeable pinker. Strangely, when I open documents in CS6 created in the older version, they retain the old, proper "beige" look. But the same color settiing in a new document produces this "rosey beige" color.  (By the way, this isn't a "monitor issue"...... I have printed out the documents, and it's just as apparent in the printed versions.).
 
I suppose I could just use an altered color setting with less magenta, but I'd like to find out why this is happening, and why I can't use the same color settings I did in the old version of Photoshop.