Mac Studio Fix Powder C5

Mac Studio Fix Powder C5

Mac Studio Fix Powder C3How similar are these shades? NC45 (in studio fix powder foundation) has been my color for almost a year but a co worker said C6 or C7 might work better since I'm really starting to notice how orangey and muddy and streaky it makes my face look after by the end of the day. The MUA at my local mall just insists that's my shade but when it looks like my face got a tan and the rest of me didn't, I have to disagree. Should I try the C6 shade? Or maybe up a shade to NC43? Are C shades pinker or redder? Neutral? Mac's shading system trips me up sometimes. I'm really considering jumping ship to Prescriptives since I've heard nothing but good things about them. Any advice is appreciated ladies!
Mac Studio Fix Powder Nc50OK I finally got officially foundation matched by a MAC MA the other day. She matched me with Studio Fix Powder in C4- on application it looked good but it did shift a bit and turned orange. Then I tried NC40- she says it's more beige than C line. Did the same thing but upon application the tone was off not enough yellow. Then I wanted to try out C35- she says this is too olive-green toned for me and NC35 would be better since she thinks I have more of a golden beige skin tone ( plus it was the color I used in the past- pretty good match but not enough yellow for me. ) 
OK here's the question- if she originally matched me up with C4- is it that much different than C35? I thought C35 would have been a better match since it seems like the NC line doesn't have enough yellow or is C35 much more 'Olive' than C4? 
Side by side it doesn't look that much different- I was too tired to try out C35 and just got NC35 but should I really have gotten C35 instead and not listen to the MA and trust my instinct?
TIA!
Mac Studio Fix Powder Foundation C5Shop MAC Studio Fix Collection online at Macys.com. Made to perform. Made by artists. Our iconic bespoke collection of pro-crafted shades and textures addresses every skin tone, every lifestyle, every climate, and every shade of you.
Shop MAC Studio Fix Powder Plus Foundation online at Macys.com. A one-step powder and foundation that gives skin a smooth matte finish, while controlling shine. A one-step powder and foundation that gives skin a smooth and even all-matte finish with medium-to-full buildable coverage, with a velvety texture that allows skin to breathe.
OK I finally got officially foundation matched by a MAC MA the other day. She matched me with Studio Fix Powder in C4- on application it looked good but it did shift a bit and turned orange. Then I tried NC40- she says it's more beige than C line. Did the same thing but upon application the tone.
Mac Studio Fix Powder C5We put M∙A∙C Studio Fix Powder Plus Foundation to the ultimate test of seeing how long it wears and, not surprisingly, the formula lasts for a full 12 hours! This one-step powder and foundation gives skin a smooth and even ultra-matte finish with medium-to-full buildable coverage – with a velvety texture that allows skin to breathe. Long-wearing, colour-true, non-caking, non-streaking. Movie effects app for mac. A one-step powder and foundation that gives skin a smooth and even ultra-matte finish with medium-to-full buildable coverage, with a velvety texture that allows skin to breathe. M∙A∙C Studio Fix Powder Plus Foundation is long-wearing, colour-true, non-caking, non-streaking and non-settling – all for 12 hours. This pressed powder foundation is available in our most inclusive range of colours.