@Jennifer3401
You can use the "change" option on the reservering.
First click in the pricefield, then click outside the Pricefield, it will then show at bottom of page the total amount the guest is paying now. Make a note of it.
Then change the accommodation, choose 'save" and after that click again in the Pricefield of the change form and set the correct price. Click ouside pricefield and It shows again the (new) amount the guest will be paying.
It will also show you the difference in what you will be payed. It should be almost zero if same price is set.