I don't have an answer to your question but I can give you an advice to avoid some problems if you work on different eZ Publish installations :
Don't use simple id's (in override conditions and in template fetches) because they might change from one eZ install to another. Try to use remote_id's (node remote_id and object remote_id) instead.
There is various syndication extensions around, but they are far from perfect and has a whole slew of issues which explains why they are not downloadable.
Common for most of them is that remote_id is used as identifier for content, so point by Kevin above is valid with these as well.