Conflicting Lab Color Values

We are screen printers, and I am trying to set some print standards for our printers. ISO 12647-5

Fogra9 is for screen print, but i can't seem to find a profile to install (SC_GC2_CO_F30), only find the data.
However, Fogra information sheet says Fogra9 is practically identical to offset on gloss art paper (Fogra39?),
so should i forget about Fogra9 and use fogra39?

For Fogra9, why are the Lab values different (Fogra Vs. ISO) when they are both for 12647-5, gamut class 2, especially in Cyan and Yellow? Both are black backing for measurements.

Fogra9s.txt (Screen printing acc. ISO 12642-5, SC_GC2_CO_F30, gamut class 2)
Lab Values
100 Cyan 57.36 -37.40 -49.83
100 Magenta 47.68 73.16 -6.13
100 Yellow 88.28 -4.97 94.76
100 Black 19.14 -0.14 1.44

ISO 12647-5 (gamut class 2)
Lab Values
100 Cyan 52 -33 -51
100 Magenta 47 74 -5
100 Yellow 89 -9 83
100 Black 18 0 0

Once i know which Lab values to aim for, then i'll continue on with a test print on the press to do some measurements of solids and halftones etc..
(At the moment we print by eye, but we will get a densitometer soon to measure halftones properly so we can create better (correct) films and prints etc. with a standard to aim for)

Thanks for your help!
Brett