You will still have access to the physical memories yes.
But the thing is that your consciousness in the dreams are not like the one in the physical.
Most people when they are in the physical almost always go through their historical data and the possible future data and scan it back and forth disturbing the concious present moment.
That kind of thing is not something that happends when you are lucid.
When you are lucid you decide when to collect data and what kind.
You can access your physical data because the memories are carried over to the dreamscape.
So you see, most people are dreaming in the waking physical world also.. they are not lucid very often so they never really understand who they are.
You will still be you, even if you dont create mental movies of your memories.
You may have some created personality when carrying out a dream scenario, but when you get lucid in it you will understand who you are. You may still have the characteristics of your created character, but you will still be you.
The physical you is very hard to calm down, most thoughts and ideas from the brain will make you follow the status quo and not do the things like killing other people and stuff because that is not allowed there. But in the dream you can do it like eating candy.
There are no barriers.
Feeling bad about killing another beeing is just a physical created idea. It is a good rule because the physical is not as flexible and if you kill one there it will be very hard for that soul to jump down again,.. it takes a while

Your mind in the dreams are more flexible, you can change it to suit your needs.
You will have the memories of you physical self if you want to, but you dont need it to be yourself.
When you are in the present moment you are more aware of yourself and understand who you are, but when you have thoughts running through your mind all the time you actually only are a character.
When you are lucid you will be aware of your physical self if you want to..its up to you, and most times you will be when you get lucid.
Because if you are not aware of your physical self you would not be able to get the understanding that you are dreaming.