Is there a difference between "Fitness is beauty." and "Being fit is beauty."?

Usually, you would use a noun with a noun - both 'fitness' and 'beauty' are nouns so you could say one is the other, e.g. "Ignorance is bliss." "Being fit is beauty" does not sound correct. I wouldn't necessarily use "Fitness is beauty" though - rather "Fitness means beauty" or "brings beauty" - something along those lines?

Both are non-sensical. A better way of saying the same idea would be "Being fit is beautiful". (Noun-verb-predicate adjective)

They both sound stupid.