Not quite…
/1.1/statuses/mentions_timeline == /1/statuses/mentions – they’re really the same method, just with some changes to how you access them. /1/statuses/mentions didn’t really do what you thought it did.
To get what you’re after, you want to use /1.1/statuses/retweets_of_me – you would have wanted to use that method in API v1 also.