v1 has 4 x part 6628 in black and 4 x part 2736 in light gray
v2 replaces all of the 6628 with 4 additional 2736 in light gray (for a total of 8)
v1 uses 4 x part 6540a in white
v2 replaces those with 4 x part 6540b in white (for a total of 4)
In other versions the 6540a and 6540b can be Light Gray. They might have come as spares? See article.
In some versions, 6542b appears in Black