The Z9x Pro is a later model than the the Z10 Pro. It has a better chipset, and a few other additional capabilities (that I'm not fully sure of). (For most people's use the older Z9x will be fine).
The Z10 Pro is basically the old Z9x (non Pro version) with a HDD enclosure and a RCA output (AFAIK these are the only differences).
The Zidoo official Facebook group/page a a decent resource for information:
Melde dich bei Facebook an, um dich mit deinen Freunden, deiner Familie und Personen, die du kennst, zu verbinden und Inhalte zu teilen.
www.facebook.com
You could also check with the distributors. I bought my Z9x from Melodymedia and they were very forthcoming with comparison information. It's best to call them up.