I'm interested in the two Italy colors: in some color schemes (like this one), modern-day Italy is grape-green, but in other color schemes (like the X2), it's rust-red.
Any idea on when this split happened?
(I'll also be crossposting this to the main thread for these questions.)
I can confirm that the split predates X2.
Light green (111,189,72) was used to indicate Savoy/Piedmont/Sardinia (it was all one kingdom for a long time) by TACOS, GCS, ARCS, RCS, MCS, and CCS. A darker green (0,146,70) was used by GCS for a unified Italy.
The rusty brown (153,51,0) was used for (western) Romans by TACOS, ARCS, RCS, and TCS. UCS (the ur-colour scheme) used an imperceptibly darker shade (134,34,0) of that brown for the same. All of these used the colour for a unified Italy except TACOS, which chose to distinguish between unified-by-Rome and unified-by-Piedmont Italies.
(Yes, I still have my old file in which I noted the exact details of every prior colour scheme.)