An album's track titles must all be unique per music store guidelines.
If you have track titles that are the same, you will need to add versioning information or add parts to the titles to differentiate them.
Versioning:
1. Somewhere over the Rainbow (Intro)
2. Somewhere over the Rainbow
Parts:
1. Livin' on a Prayer, Pt. 1
2. Livin' on a Prayer, Pt. 2