Виная или Буддийский монашеский кодекс.

The precepts for the Sthaviravada Vinaya fully-ordained monks are 227. They are divided into several different classes:
4 defeats
13 remainders
2 indefinite
30 abandoning downfalls
92 solitary downfalls
4 individual confessions
75 faults
7 practices that pacify conflicts.

On the other hand, the precepts for the Mulasarvastivada Vinaya fully-ordained monks are 253. They are also divided into several different categories:
4 defeats
13 remainders
2 indefinite
30 abandoning downfalls
90 solitary downfalls
4 individual confessions
112 faults.

So there are small differences between the two schools. For example, among the 112 faults in the Mulasarvastivada system, there are 7 concerning the wearing of the lower garment. In the Sthaviravada system, this subject appears as only one fault. But as these examples show, although there are minor differences among the schools, regarding the root precepts they are identical.

Likewise, there are differences in the background stories given. When the Mulasarvastivada Vinaya texts expound on the downfall of "Carrying wool", they recount the travelling of six monks to Nepal in some detail. The Sthaviravada mention only their travelling to a country in the North.

Further differences are that the Mulasarvastivada considers being an albino as an obstacle to receiving vows, while the Sthaviravada does not mention this; and when the Mulasarvastivada school maintains that at the time of ordination only head and moustache need to be shaved, while one of the other school includes also the eyebrows. Also in the Sthaviravada schools, when a novice monk breaks any one of the 10 novice precepts, his vow is broken but it is not a defeat, which means that he can take back that precept and return to his previous novice status. But in the Mulasarvastivada school, once a novice monk breaks any one of the four defeats which are included in the ten novice precepts, he is defeated and not allowed to take that precept back and return to the status of a novice. So there are some differences such as these.