1. We went there two days ago.
2. We went there the day before yesterday.
(Are both the same?)
3. We will get there the day after tomorrow.
4. We will get there after two days.
5. We will get there in two days.
(What about the three? Are they all the same?)
1 and 2 mean the same thing, yes.
3, 4, and 5 all mean about the same thing, too, yes.