May have solved my own issue. This method seems to work best to make an exact replica of Rekordbox collection on a separate system using a thumbdrive to store the files
1. Copy music directory from laptop 1 to USB (for me it was /music/ which has about 10 subfolders
2. go into rekordbox, choose library - backup and save it to USB. It saves it as a ZIP file with the date
3. Go to second laptop, load rekordbox, choose library-import
4 restart rekordbox
5. select all tracks in collection, choose relocate and point it to teh USB stick
6. Enjoy having rekordbox with a duplicate library saved on a thumbdrive
Hope this helps people