By default when you cut and paste rooms to the same place or another view the room numbers will shift to the next available numbers.
If you need to maintain the original room numbers, the following workflow will do so:1. Select everything in the view > Filter > select Rooms.
2. Create > Create Group.
3. With the group selected Cut, then Paste the group as needed.
4. After the group is pasted, select the group > Ungroup.
The room numbers will be maintained, and afterward the group instance can be deleted from the Project Browser > Groups > Model.