I see the difference. Do either of you suffer from more stress, anxiety or depression? If so, how much compared to him? Two factors could be involved in your case. One, the drugs can trigger a hormonal shift causing the balding gene to become more sensitive and triggered. Second could be epigenetic where your environmental influences differ in some ways.
You do realize you can really help us out with genetic balding and clear up the conspiracy theory if indeed these medications can make your balding pattern accelerate faster than if you did nothing. I can tell you when I first went on finasteride about 15 years ago I really believed after 8 months on it, it actually accelerated my loss. In that short amount of time, I lost more hair than my whole life time. But I was told it was a shed and I would recover. But I later found out, I was genetically a poor responder to finasteride so I had to find an alternative treatment. I decided to go with Proxiphen and continue with finasteride just in case I was wrong. After a 15 years, I have maintained fairly well but never back to baseline. I come from a strong history of balding on my father's side with high NWs and genetically tested positive to have the balding gene. So either my balding pattern is a snail's pace genetically with or without medications, or the medications are slowing it down.