If you talk about the transparency blending space, it is a document wide setting.
Used images can have any color space.
Hi Willi, sorry - I am new to this.
Just checked and I do have my transparency blending space set to CMYK, but the same colored box that I copied across from artboard 1 to artboard 2 looks more dull and not as vibrant. When I export to PDF for print, I'm still getting one bright colored, one dull.
What am I doing wrong?
Can you provide the file (only with the objects which have the problem)?
It sounds like you have some sort of transparency or effect on page 2, so the blend space is kicking in. Try changing it to RGB.