Unfortunately, I don't think so :-( AC:NL stores its data in different memory addresses. My dumper only dumps an specific address that contains current player and town data. If you try that, it will probably crash.
honestly I odn't care so much if I lose my catalog and museum. I just REALLY like my town's layout. so if the town can be edited by your dumper, than theoretically I could downgrade, start a new map, and when your RAM dumper/injector is a little smarter (such a river editing and building placement) I could theoretically edit it to mirror my old town