93B improve on noise? or did they just add the VLS.
It's a new major variant of a submarine and likely can be considered a new separate class.
We do not know definitively what all of the changes they've made, and can only do informed speculation.
If you want to ask what the current educated guesses/consensus is, ask that instead, and please do so in full sentences.
Too many of your posts are short one or two liners, even when asking questions. Please put some effort into phrasing your questions more carefully with greater specificity.