Hello Sebastian Menendez,
If you want to use the same database you need to change the applicationName property in the cms node of the web.config file, because there will be existing website with the same application name in the database.
You can gather additional information from our User Manual section Exporting Web Sites as Templates
Another option is creating a sql scipts and some tool that uses Sitefinity API
to migrate all pages.
Let us know if there is anything else that we can do for you.
the Telerik team