Vitamin C is not always printed as vitamin C
Labels rarely say vitamin C on their own. They say ascorbic acid, or acerola cherry extract when the source is a fruit. Vitamin E appears as d-alpha-tocopherol in natural form or dl-alpha-tocopherol in synthetic form, and some men's-health material points specifically at the natural version. Vitamin B12 shows up as cyanocobalamin or methylcobalamin.
None of these names are deception. They describe the chemical or botanical source of the same nutrient, and knowing them lets you compare two products that look unrelated on the front of the pack.