Unless the estate qualifies as a small estate (see the link at the bottom of the page for more information), if there is a will then there are few differences between applying for probate or confirmation.
Just as with probate, the assets of the deceased are frozen upon their death. As a result, executors must have their appointment confirmed by the Scottish Courts before they can begin the process of administering the estate. An executor who has been named in the Will is known as an executor-nominate.
Unless an executor has chosen to decline office or is already deceased (known as predeceased), confirmation is obtained in favour of all the nominated executors.