You'll have to log into the account with the new SSN to view the wages. Regarding stimulus, you'll have to request it through the "Recovery Rebate Credit" on the 2020 taxes which you file in 2021. See question B9 in the link below:
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-b-requesting-my-econom...
Here's the Recover Rebate Credit information:
https://www.irs.gov/newsroom/recovery-rebate-credit
