OMG. Not another 'shroom debacle.
Mushroom is technically not a color name, it's the name generally associated with interior color
code (xx5), and may appear in the EPC. However, AFAIK, for all 1980's models in USA, this would be the same color and was indeed called "Cream-Beige". Look at any dealer sales brochure from the 80's, they should all show "Cream Beige". You won't find "mushroom" anywhere except in the EPC charts, maybe... I looked up a 126 and it showed "cream" for interior xx5. Just as a nickel is a coin but a coin isn't necessarily a nickel, cream-beige/cream is mushroom, but mushroom isn't necessarily cream-beige/cream.
Specific color codes are always FOUR digits in length and vary by the material (plastic, vinyl, velours, fabric, leather, etc). These must be looked up in the EPC charts.
Things get worse in the 1990's as MB had different color variants of mushroom/xx5, changing to Parchment for facelift 124 chassis, and although pre/post facelift may have the same xx5 interior code, the colors are visibly different and 4-digit colors codes are different. Same with code xx4 (Date), which changed from Palomino to Saddle for facelift 124. Oh, and the name Java didn't exist until around 2000?
Anyway. The chart shown above is both technically inaccurate AND confusing. A business that specializes in this stuff (1) should know better, and (B) should do their homework so they aren't giving customers misleading information that may result in receiving the wrong color.