This is highly unlikely. After chatting with a knowledgable friend about this the most likely reason is that the characters for this multi-system campaign (Call of Cthulhu, Trail of Cthulhu and Realms of Cthulhu are supported) were generated for CoC's engine first - explaining for example "the Professor's" unbelievably high smarts score - he starts out at d12 (according to my friend intelligence is a crucial attribute in CoC's engine) - but also all the other inconsistencies.
I found 5 character descriptions with their sanity scores wrong (that's maybe a quarter of all PC and NPC descriptions). None have the Guts skill, something at least an experienced soldier should have ("having seen stuff"). Also "the Professor" is supposed to have researched the occult, and has already a "Knowledge (Mythos) d4" - so he could have a Guts skill as well. The characters show signs of not having been properly generated according to SW rules - like having edges they don't qualify for, or not knowing enough languages compared to their smarts die.
So, as far as I can discern, the CoC version came first, and the RoC version of the same document was a conversion, and as such has some errors.
Thank you all for your input. I think the right way to go will be to regenerate the needed characters properly, and include the setting-required Guts-skill. I see it more as a gauge for establishing how hardy a character is to begin with - after all it's a skill freely selectable at character generation, unlike "Knowledge (Mythos)". Kind of like a little dial that goes from pale little scared boy (scared of everything) up to Indiana Jones (seen worse).