A panel physician cannot link your old meds to the new request. They have no way of doing it.
IF you have provided meds upfront, i.e. without IRCC asking for them, it may take weeks before they make be attached to your file. This is because the meds you submitted will have to be manually attached to your file. Whereas the new request you received, the IME number on it is already attached to your file, so as soon as your submit your meds, it will get updated in your application and reflected on your account.