Importing Direct to DB – GUID Question

Short answer: yes

The GUID field is meant to represent a globally unique identifier for the post. In WordPress we just happen to use the URL. The GUID field should never be thought of as an actual URL, though … just an identifier for the post.

In reality, the GUID field could contain anything that’s unique. But if you have two posts that share the same GUID, you might want to consider bumping one or the other. Importing the CSV of posts into an empty blog and using the WordPress Import/Export mechanism would help. Or setting [n] to be the ID the post will have after import.