The dealership told me that my interior color, code #275 is "Cream beige", but this website

http://www.amcon-luxled.com/mbcar/

tells me that #275 is Mushroom. So I guess they're the same thing. On eBay many people have advertised their cars as having "Parchment" interiors but when I decode the VIN's it comes up as either mushroom or cream. My question is, does cream beige = mushroom = cream = parchment?

I'm looking to replace some interior items, so it's pretty important for me get this straight.

I think it depends on the year. "Parchment" was from the '70s. Our '90 300TE has "cream-beige" on the labels under the carpets. More recently "mushroom" has been used and "quartz" now seems to describe the light coloured interiors.

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.

That's funny... I've seen lots of W124's with interiors labelled as "Parchment" and they do seem brighter than my mushroom / cream beige interior. I wonder if it's just because those cars are cleaner than mine?

I checked the sales brochures I have for the W124 and other models around the era you describe and they all show Cream Beige as opposed to Parchment or Mushroom or anything else similar.

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.