Of the four, the first one works best for me. It's the only one which clarifies that when comparing two languages, neither should seem superior. The others are either ungrammatical, or confusing as to what is being compared. However, I would use something other than 'higher'. I'm not sure what you mean by a language or culture being 'higher'.
Perhaps one of the following would convey what you mean:
'one should not appear better than the other'
'one should not appear superior to the other'
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