If you have SATA but don't install the drivers, then you don't have SATA. You will have to check your drive manual to ensure that it is properly disabled, but, with a non-SATA configuration, no you don't need identical drives.
The different versions of SATA provide either backup or speed benefits. If you go for backup, a single drive failure merely results in loss of one copy. Of course there is some loss of performance whilst the back-up is being written. If you go for speed, if either disc fails, all your data is lost, so you need good back-up elsewhere.
Not all motherboards support both versions of SATA, so you will need to read up about this in your manual. You might find click here interesting.