@ Kenneth
The entry ID has nothing to do with the custom entry order…. so yes, that would cause you some trouble if you were trying to use them interchangeably.
Just like WP does with pages and posts it will automatically assign an entry its unique ID when you add a new entry to the database. This ID is permanent and not changeable.
Here’s the link to a FAQ which explains how to locate the entry ID.
I think what you are asking is if there is a way to import/export the custom entry order value, correct? If it is, then, presently no. There is not. This is actually mostly due to oversight. I just added export support to the CSV Export All tool. I also added support for importing it via the CSV Import addon. The next update to both will include these changes. Of course they order calur will only have an impact is if the Custom Entry Order addon is installed and active.
Hope this helps, let me know.