Can I use appCode while Xcode 4 is open with the same project?

I know that appCode uses the tools provided by Xcode.  What I'm wondering is, can I have Xcode running in the background, with the same project open as what I have in appCode, and essentially use appCode as my editor/debugger?  Will Xcode be able to keep up with the changes I make to the codebase, or will it have a cache of some sort and somehow overwrite the code I've written in appCode?

Message was edited by: undetected - clarified title.