I need to make a more comprehensive answer, but the short one is:
##Depends on the color profile.##
Depends on the color profile.
The same Pantone will have different CMYK values depending on the color profile used for converting them.
And also depends on what version of the color profile conversion matrix is used. That sucks actually, but it is how it is.
This changes sometimes are justified, let's say the development of a new ink formula that needed to change because you do not want it to be toxic for example, ok you changed the formula and how this renders the color. Or the specification itself changed a bit because more acurate measurements were taken.
But sometimes these libraries changes with no apparent reason (none that I know)
So, Define your profiles and let the profiles make the adjustment for you. That is more accurate than relying on external sources... Including Pantone Website Itself.
If you have a Pantone product you can download the latest versions, but in my poor inexpert opinion, this just adds one more variable to the chaos. Use the library your current Adobe or Corel application has.