Can I use the track data and playlists in my Serato DJ Lite, etc. in Serato DJ Pro?

Yes.

 If you have already created a library using Serato's DJ software (*), you can use the previously created library with Serato DJ Pro as it is.

 If your Serato DJ Intro has already created a library, you may need to reanalyze your track.

 *ITCH, Scratch Live, Serato DJ Intro, Serato DJ, and Serato DJ Lite