Illustrator :: Color Differentiation When Exporting To PNG

Whenever I export my artboards to the PNG format, I receive a slight change in the bitmap colorization.
 
In Illustrator, my colors are perfect, but when exporting to PNG, the end result shows an increase in color vibrance - making a light blue (for example) show as slightly more turquoise/sharper light blue.
 
Example:
 
(This is a screenshot capture. Illustrator artboard is on the left hand side, the exported PNG example is on the right hand side.)
 
So, my question is if I am doing something wrong with my color settings?

My settings have been set in my Adobe Bridge to:
 
Europe General Purpose 3
RGB Space: sRGB IEC61966-2.1
CMYK Space: Coated FOGRA39 (ISO 12647-2:2004)
 
PS: I constantly switch between creating graphics that are used for the web and other on-screen web applications (such as GUI's) and printed booklets and posters, etc. I've always had immense trouble finding a perfect working space with web and printed material. Any color settings or some kind of best-practice working environment to create consistent color.