Default [Q] /data partition

Greetings developers and android enthusiasts!

I'm quite new here and I'm not sure how to word this correctly so here it goes... I have a nandroid backup of a rooted stock ROM 4.3 and I have flashed a custom ROM (android version 4.4) for my note 2. I already booted the phone with the new ROM and it works. I forgot I did not back up the apps+data using titanium backup back when I was using 4.3. So the question is, can I restore the 4.3 /data partition to the 4.4 ROM? If not, any alternative ideas? To my understanding, the /data contains the apps+data, unless I'm wrong.

Thanks in advance!