Have a look on Google images, you will see that there can be a few different shades, however, the 94th wore a darker green facing colour than the 24th. I had been looking for the shade of green that the 24th wore and came up with grass green, and there appears to be many shades of that, in the end I settled for a medium green (not too dark and not too light). I would imagine that the green worn by the 94th was a dark green, something like a Brunswick green. I have looked in my books and found no watercolours, paintings, etc, depicting the colour, but in the book 'Uniforms and Weapons of the Zulu War' I did find it refered to as just Lincoln Green. So take a look on Google, you might get luckier than I did and find a picture showing the facing colour of the 94th.