Resource Management | Confirmed vs Unconfirmed Hours

Hello, Community! In RM, I've noticed that incurred hours includes confirmed and unconfirmed hours in RM. This is where I've directed PMs to obtain the actuals and total number of hours for the project. There is an 'Account Setting' that has 'Incurred Hours and Amounts'. It is currently set at 'Confirmed hours and unconfirmed past scheduled hours' - there is an option to have 'Confirmed hours only'. If we were to make that change would that impact the 'Project Actuals To Date'?