Legal separation & final divorce

Do the agreements on the legal separation carry over to the settlements of the final divorce??? or do these ones get to be re-negotiated at the time of the divorce signature?

I would like to know if I need to make sure all aspects of the divorce and asset separation are reviewed in detail prior to signing anything related to separation… (such as alimony, accounts, child support, etc). Or if I missed anything, do I have a chance on re-reviewing it once we sign the divorce?

A separation agreement that distributes property is valid and binding forever.
If you do not have a formally executed separation agreement (distributing property and awarding alimony) prior to divorce, you lose your rights to seek the same through the courts.