Thank you for your interest in the Bitnami solution
The Multisite solution uses the same core code of WordPress to serve different sites, if you want to develop all the pages using the same WordPress version with the same features, I think this will work for you.
We always suggest the all-in-one WP migration plugin to migrate the data of one WordPress site to another one but please note that the plugin is not free when using the multisite version.
I don't understand this question, can you clarify it?
I also suggest you ask in the official forums of WordPress to obtain more ideas to develop on top of the application.
We provide different solutions of WordPress:
- single WordPress
- multiple WordPress apps (that don't share the source code, you can install different versions)
- Multisite solution