When working with Curves you can't apply a CMYK setting to an RGB image as they're two completely different colour spaces. It simply won't work.
The best way to go about it is to adjust your CMYK image, flatten it, then convert it to RGB. This is better than going from RGB to CMYK because CMYK has a smaller colour range than RGB. Going from RGB to CMYK requires a bit more tweaking.
Even simple Adjustment Layers (like Brightness and Contrast, for example) that can be swapped between RGB and CMYK images give slightly different results on each.
So it goes.
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