Retirement tax questions

@dmertz In this case I contributed $6,000 in April 2024 and $2,000 in December 2024 to my SEP IRA. Thanks to DMertz I understand the custodian will reflect $8,000.00 in the Form 5498 they provide for 2024. 

If I change my Turbo Tax entry for 2023 to $6,000 will this suffice? Or will it trigger an IRS red flag as my reported sEP contribution is only $6,000 for 2024 while the custodian’s 5498 shows $8,000? I’m not sure they will recognize that the $2,000 contribution made 12/21/24 was actually for 2024 (now). Thank you so much!!! Your expertise is valued and appreciated.