It can be done but a very large tank is needed. Lots of driftwood and plants with plenty of hiding spots. There are some cautions. Just trying to minimize interaction. If there is any then can get away and be alright.
Both fish are territorial and can lead to fighting in the tank. Both fish will know each other are there.
BGK do have a reputation for bullying fish. Zebra knife if bullied will likely die. They get stressed and begin to withdraw and will not eat.
The other is that true zebras are not readily available in the hobby and BGK's are and I would choose the zebra over a BGK.
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