The definitions of levels vary wildly and there just isn't a good way to compare them. People can be justifiably one level at one company, while being quite a different level at another company.

not all companies have the same highly structured leveling system as amazon/google/facebook. look at the comp by level at jane street (https://www.levels.fyi/companies/jane-street/salaries/softwa...), it obviously doesn't make sense.