The Zip to Terr utility runs on Accounts in different countries that have the same zip code. The Country Code field is not being utilized, and both Accounts are assigned to the same zip code.
This is working as designed.
If there are identical zip codes for different countries, add a Rule Criteria in the Account Assignment Rule Detail to include the ISO Alpha-2 value of the Country Code.
Navigate to: Setup --> Administration Setup --> Manage Territories --> Territory Hierarchy to make the change.
CRM Help Documentation: Zip to Terr
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