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Unless the specific rules in Article 4.5.1.3, "Determination of derived types", of the Fortran 2003 standard are satisfied, repeating a type definition word for word may still cause the compiler to regard the two types so declared as distinct.
When I saw this "feature" the first time, I was surprised, too. However, it does make it easier for the compiler to keep track of user-defined types.
The IMPORT ... statement is provided to alleviate the problem that you ran into.