Yup, there are some symptoms that are common to both but having them doesn’t mean both. Check out neuroscientistnews.com but remember only 25% of new studies can be replicated. I personally don’t believe there will not be any improvement. There is just too much they don’t know. Look at how much they know about infants that they didn’t know before.
I don’t know your specifics but I’m OLD and still growing new brain cells. Other parts of the brain take over for lost parts, too. Check out aphasia and singing to see how remarkable we are. Freepmail me if you wish.