The simple answer is yes, the slightly longer answer is "Yes, but how much of the data do you want to bring across?"
When you export projects as XER files, you will also have all the configuration as well - your calendars, resources, activity codes etc. There's some really good tools out there that will help you check what is in an XER file, feel free to get in touch if we can help with that angle.
The change in database will not be an issue
Thank you very much for your response.