I have no idea about CMYK, and probably little colour sense (other than liking yellow and colours close to it heh), but I poked some numbers into GIMP and came up with this:
Looking specifically at F5..F8:
F5 = 6 0 63 0 = the middle of the Enter key from the photo with the toxic green on page 1
F6 = 78 0 94 4 = the original mockup colour
F7 = 20 0 51 19 = the second mockup (a few posts up)
F8 = 38 0 78 1 = the colours you said you used
To me they all look different. Perhaps something screwed up saving the file, or GIMP interprets the CMYK colours differently or something.
Personally I like the F8 colour - what you said you got from Google, although it is quite different to the mockup.