I can't swap the parts inside the component after copying it

I can swap the parts of the component when I deal with the main component. Once I copy the main component and it becomes an instance, I can’t swap its parts. You can see it in the video
Here it is possible, because its the main component:

Here I am dealing with the instance, hence I can’t change swap its parts:

There is no option to swap elements in instance like you want in Figma.

Guide to components

The solution for you is rewrite the text in your cells instead of swap it.

Or you can make each cell a component and swap(change) it one by one.