Windows XP Service Pack 3 (SP3) is a rollup of the hotfixes and updates released since the Release to Manufacturing (RTM) of Windows XP Service Pack 2 (SP2). It does not include any new features.
System builders who updated their images with SP2c will not have to re-image in order for the product keys on SP3 Certificates of Authenticity (COAs) to install the software successfully.
These two products will not have the product key range extended with this release. You can continue to use existing images without any issues.
The SP3 releases for these products will be available only through Windows Update.