Sorry I missed your posting.
First: Yes, the SATA cable is the same between the tow systems and people have been installed HD's in SSD models to create fusion drive'ed mini's with larger config's than Apple ships.
As to your desire to put in a 2.5" SSD drive instead of a HD, while it's possible. It's not something I would recommend. Most people need more storage than 256 GB your SSD offers. As you most likely know larger sized SSD's are very expensive! While their price will drop it will still be awhile. In the mean time I would recommend going with something that offers better performance than a traditional HD and that is a SSHD hybrid drive. Review this: Seagate Laptop SSHD.
Another alternative way is an external RAID'ed drive setup connected via the Thunderbolt connector.
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