This is a good powerpoint. http://www.fifa.com/mm/document/afdeveloping/refereeing/8.%20law%2014_559.pdf Easy to follow Yes/No and what happens. Both encroach - kick retaken.
Not quite the same, but a second penalty resulting from the corner after the first penalty was saved http://www.skysports.com/football/news/11827/10839074/watch-salvatore-sirigu-saves-two-penalties-in-two-minutes-against-atletico
Another defending error following a save here https://www.express.co.uk/sport/football/759340/Turkish-defender-sensational-own-goal-penalty-save-stupid-bizarre