Do all the sets of the board CBSE contain the same questions?

May be or may not.

Question ask in CBSE differ in many way.

1. Same question at different no. Example – if one question at question 6 than that same ask at 10 in another se.
2. May be same question ask but they ask little bit different.
3. Last type is that they ask different question, means some question match but some question are different.

Third type is most common type to ask question in different sets.