CCPC T2 return -- Prior Year code 3849 does not equal current year code 3660 on schedule 100

Rolled over TurboTax T2 (Business Incorporated ) from 2019 to 2020. Same CCPC. Reviewing the schedule 100 -Retained earnings. Why would the prior year - code 3849 Total Retained Earnings not equal the current year  Retained earning /deficit -start code 3660?