Can I boot my recovered SSD as a Mac OS X installation
It depends on the system installed on the SSD. If the Mac Pro is capable of booting with it and it fits physically, then I see no problem why it shouldn't work.


MacPro1,1 - 2,1: max system version: 10.7.5
MacPro3,1 - 6,1: max system version: latest
all MacBookPros 2008 (4,1 and 5,1) can run the latest system


Usually all necessary drivers for any Mac (which can run the system) are included in a standard system install.

There is only one exception: systems for new Macs with absolutely new hardware usually contain new drivers though the minor system version number is equal to the general current one. The build number is different though. The newly released Mac can't start from the general system release valid for all other Macs.