Not without a profund knowledge of the database and how it is programmed.
Well the best way would be to write down what you have modified, do a release change and redo everything you modified if it is in the design elements we deliver. Because overwise you would perhaps loose most of the new functions.
What we do not overwrite is your configuration (if you do not want us to). Navigation documents, Mail Templates, Changes in existing keys of language documents, your keywords all those are things we do not change.