cvs merge from uncommited working copy

I want to register changes in multiple branches by a single
commit. I develop the desired changes in one branch, then
copy to others, then go the root directory and launch 'svn ci'.

I can copy the changes using 'svn diff | patch'. But, if
there are added/removed/copied files, I have to declare them
manually.

It would be nice to use 'svn merge' to automatically
transfer all changes. Unfortunately, I could not find a way
to do that.

So, the question is:

Is there any possibility to transfer uncommited changes from
one working copy to another? Maybe, there is some additional
tool doing this?

-- 
Max
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