thanks so much for reaching out. Yes, you are so right. Symptoms of both PD and AD often overlap and are very similar. However, they are very different disease process. I have included an article that might help you help to understand the differences a bit better.
https://www.michaeljfox.org/news/answering-questions-alzheimers-parkinsons-and-dementia
Also, encourage you to reach out to your neurologist with any questions you still might have. I find it helpful to make a list of items I would like to discuss prior to walking into the appointment. If you have any further questions, please do not hesitate to reach out anytime. Thanks for being part of our community. Just Keep Swimming...Lynn Marie, "AlzheimersDisease.net Team Member"