If you haven't gotten the new rabbit yet, I would suggest you go to an animal shelter, preferably exclusive for just rabbits. Most shelters would help you find the perfect match for Brioche and help you with bonding. If you want to do it by yourself, it will be more challenging.
There are lots of videos of youtube about bonding. One of the ways I find helpful is putting them both (ie: a bathtub) in "neutral grounds" where they would not be so territorial. Just watch over them in case they start fighting.
If you are going to get a baby rabbit, I would advise you to wait until it grows older and have it neutered. That was it would be less territorial and easier to bond. Good Luck!
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