Which Version are you using? Is it later version than BC190? If yes then I have a suggestion below.
But it can be helpful, if you only want to add changes in layout only then I suggest you to use in-built feature of selecting layout while running the report.
1) First, Export the RDLC and make changes as per your need. (Here I have 2 Layout ready)
2) Open the request page of the report you want to run.
3) Click on the look up of Report Layout (it will open the list of layouts) and Create New Layout.
4) Enter the Detail, Required Layout options and Ok. (Here I have selected RDLC) and Repeat the process for adding another layout again.
5) Now, you have 3 options when you click on the look up of Report Layout.
6) Now you can select the required layout while printing and give different print. (Here I have attached 3 different print as per layout)
I hope this helps..