Each mineral will have specific hkl's. I don't think all minerals in a crystal system will share hkl's except Clays and Micas tend to share them or close enough. However, the crystal structure does control pattern complexity.
If you can separate one mineral out of a pattern and can identify the basal peaks and most intense peaks, then the leftover smaller peaks should be your hkl peaks. Please feel free to reply with more information if that doesn't help.