Question:

Can the SAML profile metadata from one Vault be exported and imported into another Vault?

Answer:

The XML exported from Vault may not be re-uploaded into another Vault. With an SSO setup, Vault is the Service Provider and the Identity Provider is SSO provider being used.  The XML file required to be uploaded to Vault is the information provided by the Identity Provider (IdP). 

Related Documentation:

Vault Documentation: Vault Help