There are two standard braille alphabets for Urdu, one in Pakistan and the other in India.
The Pakistani alphabet is based on Persian Braille and is in use throughout the country, while the Indian alphabet is based on national Bharati Braille.
Besides the addition of Urdu-specific consonants analogous to the additional letters in the print Urdu alphabet compared to the Persian alphabet, Pakistani Urdu Braille differs from Persian Braille in the transcription of the print letter ژ ž, which is written as a digraph in Urdu braille rather than as Persian ⠬, which in Urdu is used for ڈ ḍ.
Another such letter, ⠭ for خ x, is shared with Gurmukhi Braille ਖ਼ x but with no other Bharati alphabet, where ⠭ is otherwise the vowel o.
Pakistani Urdu Braille has several contractions beyond the aspirated consonants: Basic punctuation in Pakistan is the same as in India.