Import with replace command into existing schema

Hello Colleagues,

I am trying to do the following.

1. I have 2 schemas A and B in a system.

2. I need to copy all the contents of A into B.

3. I have exported both A and B. B as a backup.

4. Can i import A into B using replace option?? Will this cause harm to the data already available at B??

Thanks and Regards,

Akhil