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:
If the IRS used my 2018 tax return and determined that I am not eligible for payment, and I later file my 2019 tax return that changes my eligibility, will the IRS issue a payment in 2020 based on the 2019 tax return?
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
