Why can one spot colour convert into two different sets of CMYK values?

Working within Illustrator CC, I have an EPS file of a logo which has a colour fill value of:
Pantone 152 U
CMYK: 0C 51M 100Y 1K
When I copy and paste this into a new document I get a much duller colour (orange) with colour values of:
Pantone 152 U
CMYK: 2C 57M 83Y 2K
I have enabled 'ask when opening' & 'ask when pasting' for Profile Mismatches in Edit->Color Settings->'Color Management Policies' - no warning shows up.
I have also tried turning off, changing color management policies.
I've opened the original eps file and assigned my working space profile (Coated FOGRA39) and then try copy and pasting without success.
Help!

In addition to John's useful comments:
Using Pantone 512U (uncoated) isn't correct for Coated Fogra.
Why can one spot color convert into two different CMYK sets if converted by the user?
Assumed, the one spot color is uniquely defined by one Lab set:
– the CMYK spaces are different
– the CMYK spaces are the same but the Rendering Intents are different
– the CMYK spaces are the same but the Black Point Compensations are different
   (on or off for Relative Colorimetric).
Assumed, the spot colors are equal by name, but valid for different versions, both in Lab:
– this obviousl at present the most common source of deviations.
Assumed, the spot colors are defined by CMYK:
– a chaotic situation which I wouldn't even like to dicuss.
– CMYK to CMYK conversions should be avoided under all circumstances.
The solutions:
If the spot color will be printed always and everywhere by Pantone spot ink:
– purchase an actual Pantone color fan und discuss with the printer the mixture for the selected ink.
If the Pantone color is merely a design feature, but the doc will be printed by CMYK:
– choose such a color and verify by soft proofing that the color is in-gamut for common CMYK spaces. 
– read the Lab values and proceed as far as possible using Lab.
– don't use ink names, don't use any reference to Pantone.
– convert into to a specificic CMYK space in advance to the generation of the specific PDF.
Best regards --Gernot Hoffmann

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