Instead of putting the cats in carriers next to each other, try putting the hisser into a carrier and put it in the new kitty's room for just a little while.

Then see if the new kitty will come out and explore while the old kitty is in the carrier.

Good luck! You may have to ask the vet about some antianxiety meds if they cannot solve their differences soon. But I'd give it at least two weeks of really having them separated.
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Smile, it will make them wonder what you are up to!

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