You are not the first person that I talked to on here that said this. I remember a guy who worried about talking to others with anxiety as he feared he would take on their form of anxiety.
Within OCD there is a curious theme known as Emotional Contamination. It's a bit like this but it's focussed more on taking on negative character traits of someone you fear as toxic. That's not that far removed from other "loss of control" type worries on the Pure O end. The EC sufferer might worry about becoming narcassistic, a sociopath, etc. So, no different really in theme than the violence, sexual, type OCD themes except that it is a fear of external influence like some of the other themes e.g. fear of poisoning in Contamination. I would put money on someone with the EC theme being a really good person, hence their fear of becoming someone they view as bad, immoral, evil, etc. Just the same as the terrified doting loving parent with POCD or the person with violence in their theme who has never been anything other than a good person who is not violent in the least.
Like djsouthboi247 mentions about how curious OCD is, it has a nasty habit of looking for your Achilles Heel. Some themes just don't bother me at all. Contamination worries have never been much of anything for me, I can be the pig in...
but someone with Contamination themes just couldn't be so casual about it.
If you decide to obsess & obsess over something though, you can build a fear around it. Standard core belief stuff really but that's not limited to OCD.
Given the benzo withdrawal, and I hope things are going well for you now, that is going to be putting all sorts of strange fears & thoughts into your head. Try to dismiss them, think of it as the subconscious working through a checklist - "how about X? No. Ok", "how about Y then?". Try to limit your reaction to it all...which may be some achievement when going through benzo withdrawal, but if you can it can only help and if you can't, you can work on it later once you get that stuff out of your system.
As for the guy I knew who had these fears? He did take some on (which is going to happen when you obsess, and to be honest some what he mentioned can be experienced by anyone when getting more severe (e.g. a short period of Agoraphobia as you withdraw more)) but others he feared, he didn't take on at all. That suggests it's not a matter of simply being able to do so, and again it can/may be partly down to an individual's types of fears, insecurities, morals, etc.