Can two ponies have the same cutie mark?

Can two ponies have the same cutie mark?

Yes, to an extent. Ponies can have very similar talents, with very similar cutie marks. However, since everypony is unique in some way, so too are their talents, and therefore cutie marks. One example we see of two ponies sharing similar talents are Flim and Flam.

How do you get a cutie mark?

The cutie marks are obtained when ponies discover a unique characteristic that sets themselves apart from others. Twilight Sparkle demonstrates to Apple Bloom in the same episode that magic can't make a cutie mark appear, and she explains that the mark will only appear in due course.