I mentioned in my earlier post .... if you make the bank changes today, it will be too close to the 6th Apr 2025 deduction (since 6 Apr is a Sunday, GIRO deduction will be on 7 Apr). That's why personally I will make the changes after the Apr GIRO deduction with the current bank.
If you edit the eGIRO using the bank websites, you will not notice this. But if you amend the bank details using IRAS website, there will be a popup alert message (about the possibility of new GIRO plan with deduction starting from May 2025 onwards.