I just tried svn-push, and I get exactly the same:
[07:47:17] [ alex in ~/src/exclaim/svn/trunk ] $ svnadmin create --fs-type fsfs ../svn-trunk
[07:47:27] [ alex in ~/src/exclaim/svn/trunk ] $ bzr svn-push ../svn-trunk/
bzr: ERROR: These branches have diverged. Use the merge command to reconcile them.
I just tried svn-push, and I get exactly the same:
[07:47:17] [ alex in ~/src/exclaim/ svn/trunk ] $ svnadmin create --fs-type fsfs ../svn-trunk svn/trunk ] $ bzr svn-push ../svn-trunk/
[07:47:27] [ alex in ~/src/exclaim/
bzr: ERROR: These branches have diverged. Use the merge command to reconcile them.