I’ve been wanting to compared these two since I got Kitschmas a few months ago 
MAC Kitschmas Pigment
Description: Light airy shimmering pink/mauve pearl (Frost, permanent)
MAC Milk Pigment
Description: Frosty pale silvery pink (LE: Hello Kitty)
Kitschmas is in the vial on the left, Milk in the full jar on the right.
When comparing them next to each other in natural light, Kitschmas appears to have a more pink tone, while Milk has a more lavender tone. Both have the same frosty & chunky texture.
Swatching Procedure: Both pigments were applied over MAC Painterly paint pot. My skintone is a MAC NW20. Photos were taken under “natural light” lightbulbs, which mimic natural daylight.
Conclusion? I tried hard, I really did! But I couldn’t find a super noticeable difference between the two once applied on my skin. Both look the same frost/glittery pinky-lavender shade to my eye.
So I would safely say that if you have one of these, you do not need both. Milk was a limited edition pigment released in the Hello Kitty collection February 2009. Kitschmas is part of MAC’s permanent collection, and has been part of many collections (my vial is from this past winter’s Mischief Makers “Cool Capers” pigment set). It will be part of the upcoming (and highly controversial) Rodarte collection, launching early this fall.
