Import loses 'Default Value' Settings

I'm saving exports of CCK-defined and CCK-amended content types and I'm configuring several of the fields to have default values. For example, I have a few yes/no radio buttons that I'd like to start pre-checked. When I go to import these into a second Drupal instance, the settings are lost and I have to re-configure them. It would be much more convenient to have these work from the get-go when they're imported. I can provide specific exports if necessary but, judging from the code in content_copy.module, this appears to happen regardless of the field type imported.