I've been looking online and there are hardly any comparison swatches of Mary Kay's (MK) mineral eyeshadows with their supposed MAC eyeshadow duplicates except for one youtube video for certain. So I decided to swatch what I have to see what I would get. All pics taken without flash next to a window. All the rectangular pans are Mary Kay, all circular pans & pots are MAC .
First up, MK Amber Glaze vs MAC Amber Lights. Of all the MK vs MAC shadows I've swatched, these two were the closest match and I would say they're pretty dead on.
MAC All That Glitters vs MK Honey Spice with MAC Naked Lunch thrown in for comparison. I've seen mentions online that MK Honey Spice is a dupe for MAC All That Glitters and I have to politely disagree. They're close, but not exact. I threw in Naked Lunch to see if I can find another MAC eyeshadow that MK Honey Spice would be a dupe of, but Naked Lunch is a little pinker and sheerer. It's possible that there's a limited edition MAC eyeshadow that MK Honey Spice is a dupe of, but I don't own it.
MK Midnight Star vs MAC Deep Truth - swatched just for the heck of it. Close, but MAC Deep Truth goes on blacker/darker.
MAC Rice Paper vs MK Moonstone vs MAC Shroom -The Moonstone/Rice Paper comparison has been made online, but again I disagree with this one. Rice Paper has always been on the subtle side of shimmer and is less yellow gold than Moonstone. Shroom is a little closer to Moonstone, but I was surprised Moonstone is frostier and less sheer.
MAC Satin Taupe vs MK Granite vs MAC Smoke & Diamonds (limited edition). MK Granite is a little lighter, grayer & beiger ("greige") than MAC Satin Taupe. MAC Satin Taupe has a definite plum undertone to it that Granite doesn't have.
MK Sweet Plum vs MAC Sketch - Again, this comparison has been made online and again I disagree. Sketch is much more intense/darker than Sweet Plum. Both are great shades, though Sketch requires a light hand and many layers with much blending for it to not be too much for me. YMMV, of course.
MAC Wedge vs MK Hazelnut with MAC Kid (now dc'd) and MAC Rich Flesh (limited edition) thrown in for comparison. Hazelnut is similar to Wedge and Kid, with it being closer to Kid, but not dead on.
Price Comparison (Prices in US dollars pulled from both websites as of the date of this post):
Mary Kay mineral eyeshadow pan (0.05 oz) - $6.50
Mary Kay compacts (mini, regular, pro) - $16, $18, $35
MAC eyeshadow pan (1.5 g/0.05 oz) - $11.50
MAC eyeshadow pot (1.5 g/0.05 oz) - $15
MAC eyeshadow palettes (2-pan, 4-pan, 15-pan) - $7, $7, $16
All MAC eyeshadows purchased in full retail with my own money over the course of several years. All Mary Kay eyeshadows except Moonstone were purchased with my own money at my Mary Kay Consultant discount rate. Moonstone was purchased in full retail with my own money prior to becoming an independent consultant for Mary Kay.