In those cases, Syracuse being the traditional allies with Rome, both colors melt with each other.
In my Syracuse game, the whole map is just a sea of red.
Also, when making peace with the enemy, in the transaction screen, it's harder to tell apart the colors of regions to determine whether Rome or I am occupying it.
Might I suggest a change to nice shade of darker green? (Light green having already been taken by Nasamones in Africa)