No, not for matching the price. There should be an option to modify your booking rather than canceling and rebooking it.
In Marriott, if you have booked a room for $100 a night, and the price drops to $90, you can simply open your booking, click on 'modify booking,' and it will show you the new updated rates. Once you proceed with it, your booking is updated with new prices. Accor should have a similar function too. It's the same process you'd go through if you wanted to change the dates of your existing booking, except you search for the same dates instead and just accept the new lower prices.