Short answer
Islam does not make belonging to the same biradari a universal requirement for a valid marriage.
Islamic Guidance
What Islam teaches
The Qur'an teaches that peoples and tribes exist so that people may know one another, and that true honor is connected to taqwa. Biradari or family identity should not automatically become a religious barrier to a suitable marriage.
Practical Guidance
What you can consider
Families can consider cultural compatibility and family circumstances, but should distinguish social preference from an Islamic requirement. Character, faith, compatibility and mutual willingness should receive serious consideration.
Sources
Qur'an 49:13.