To be honest - Dyfunctional is actually a remix, updated version of the Japan only version of Dokken "S/T" that was released in 1994.
Dysfunctional contained those original 9 songs - which some song (if not all) were either re-recorded, parts added, remixed, etc. and then 3 additional tracks were written and recorded (incl. the bonus track).
To be honest, I much prefer the original