Okay kiddo, let's imagine you have a new toy car that you really love playing with. The first time you play with it, you remember everything about it - the color, the shape, how it moves, and all the fun ways you can play with it.
But after a while, you stop playing with it and forget some of the details about the toy car. Maybe you forget the exact color or how many wheels it has. This is an example of how memory works - we remember things really well at first, but over time we can forget some of the details.
Now, imagine you have two people who both played with the same toy car, but at different times. The first person played with the car very recently, and the second person played with it a long time ago. The first person will remember more details about the car because they played with it more recently, while the second person might have forgotten some of the details.
This is similar to the difference due to memory. If two people experience the same thing, but at different times or with different levels of attention or engagement, they might remember different details or even have different overall impressions of the experience. So even though they experienced the same thing, their memories of it can be different.