Oh my goodness yes, review from schematic! 
I do this a lot as my designs morph into something else. Sometimes for a similar design, I just copy the files to the new project, rename them, and then hack the schematic to the new functionality. Do the review stop on the old PCB and all the parts magically appear, ready to be placed.
Before you do that, you do want to "Unroute All" as you won't be using the old routing.
