Hi,
I had similar fears when I brought home my second Bengal boy around 8 mths after our first Bengal, Osiris who is an indoor cat. I took the Thor the new kitten into the bedroom and I stayed with him the first night, whilst my partner stayed with Ossie on the Sofa bed as didn't want Ossie feeling left out and blame the new arrival. The next day they were introduced under close supervision and after a few minutes of intense sniffing and protesting from Ossie, they got on fine and with in about 3 days were the best of friends, much to my relief. After about a week together we took this photo of them.
Hopefully you will have as a positive experience and they will bond as quickly as ours did. I would recommend from my own experience to keep them separated for a little while and allow Tia to get a little used to the new smell
I should also add that having a playmate to chase around the flat, play fight with and lick to death has made Ossie a much happier and contented cat. Getting a second Bengal was the best thing we've ever done. Their antics are always making us laugh and they adore each other.
Best of luck
Emma