What edition do you have? I guess Gramsci was a prolific writer in prison and there are different selections of his work around. I have the International Publishers version. Maybe the same. It has parts of the Modern Prince, his stuff on education, Marxism & philosophy, and "Fordism".
You're a good writer, BTW
Yes IMRO (or VMRO as we call it) was a national liberation movement for Macedonia. Vlado, who killed the king was a member, but IMRO was also connected with Ustase at the time.
My guess is that their "politics" for national liberation found some similar points.
It comes at no surprise since Macedonia does not share physical border with Croatia and thus there were never any "tensions" between these two nations.