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What countries should be given special consideration when merging with other Gravity data?

What countries should be given special consideration when merging with other Gravity data?

Democratic Republic of the Congo: The country of Democratic Republic of the Congo was known as Zaire between 1971 and 1997 and used iso alpha-3 code “ZAR” during that period. Starting in 1998, the country was renamed to its current name and changed its iso alpha-3 code to “COD”. When combining with other data, it is worthwhile to check what code(s) the other dataset uses to insure that the Democratic Republic of the Congo is able to match.

Romania: The country of Romania has used two different ISO alpha-3 codes over time: "ROM" and "ROU". The first code, "ROM" was used until 2001. Beginning in 2002, the code "ROU" was used instead. The Dynamic Gravity dataset follows this standard, using "ROM" for 1948-2001 and "ROU" for 2002-present. When combining with other data, it is worthwhile to check what code(s) the other dataset uses to insure that Romania is able to match.