diferentes color when export to pdf or image

[#1]

hello.

I am working on project that is giving some color problems when I export/save to pdf or jpeg/png.

I work with AI for several years and its the first time that this happens.

The file is CMYK, the pdf was exported to cmyk

What is happening? 

[#2]

hello.

I am working on project that is giving some color problems when I export/save to pdf or jpeg/png.

I work with AI for several years and its the first time that this happens.

The file is CMYK, the pdf was exported to cmyk

What is happening? 

[#3]

PNG cannot be in CMYK color mode. The format does not support that.

JPEG can have color change, because fiddling with color is one of its compression methods.

JPEG is not suitable for graphics.

On top of that, there won't be a color profile embedded in PNG when exported from Illustrator.