Post to more sites in one network

Hello,

I have a Multisite install with two website: an English one and a Spanish one.
I have a custom post type section for information about cars. I have set up categories and tags for all these so they are searchable.
I do have the categories and tags in two languages.

Is it possible when my client adds a new car on the English site it automaticly also shows up at on the Spanish website with the good categories and tags. (so e.g. category EN: 5 doors, correctly linked to catergory ES: 5 puertas).

I tried to do Three WP Broadcast http://wordpress.org/extend/plugins/threewp-broadcast, which is a simple solution, but it overrides the categories and tags and does not sync them.

Any ideas?

Greetings,
Jonathan