Welcome to our forum. I have no experience with Prozac for cats, although there are members here who have used this medication. I realize some cats require medication, but I'm not a huge proponent of putting a cat on something like this. I know the behavior is bad -- and you get at your wits end. But it appears you have been using different compounds -- and yes, they can vary! Your vet is always your best source of information, but you might want to do your research online as well.
It sounds as if you're trying to say the renovation of your home caused this change in behavior as it appears the kitties were okay with each other for about 6 years. Bengals do not like change. They also do not enjoy a lot of noise and activity, which the renovation would have caused. New smells in the home could have triggered this as well. But, it appears to be years later and still having issues.
In researching, you may find that medications sometimes have no effect after a while -- the system gets used to the drug. You might want to go to
https://www.jacksongalaxy.com and read about the holistic options he offers. I'm not endorsing them, but some people here have tried them -- some with success and some not, but only you can decide that.
I'm sure, too, there are episodes of My Cat From Hell, which Jackson Galaxy hosts that air on Animal Planet and their website that you may want to view. There may be some things there you can try, other than medication.
I wish you luck ... and please keep us informed on how things go.