In my experience in such cases are perfect (both technically, as far as I understand, and legally) and more new SP, so that you can safely download a newer distro from the same Compaq. I always put the distributions with built-in current servicepack. The Park was Dell computers and branded distro with SP1 to them. So I unpacked it, built SP3, put it back and used. Automatically activated on their computers it didn't. Legally, as far as I understand, all owners of a license for any version of Windows have the full right to use all service pack.
Problems can be encountered only in the case of store (box or OEM) versions of Windows, not tied to specific hardware manufacturers and requiring input serenika and activation — remember some new servicepackage versions were incompatible on the keys with older.