No, not at all. It's possible to assign multiple scenarios to any Export ID, either new or existing. You can even add them to an Export ID that was created by someone else.
The Export Control function allows users to combine Scenarios from various data types so that they can be initiated as a collective export when useful.
Export ID's can best be thought of as folders or binders that organize a set of Scenarios which serve some sort of common purpose or fulfill a particular use case. The capture below shows an example of an Export ID having five Scenarios created using various data types. The user can then choose, one, some, or all of these Scenarios when initiating an export.

Consider referencing the content within the Gold Client Data Echo User Guide for more details.