You should not have to amend your prior year returns. Whether you entered "various" or "RIC" as the country, they are both choices within the passive income category of Form 1116. The tax would be calculated the same. You should use the RIC designation this year as that is what is suggested.
From Form 1116 Instructions, page 15:
You don't need to report income passed through from a mutual fund or other regulated investment company (RIC) on a country-by-country basis. Total all income, in the applicable category, passed through from the mutual fund or other RIC and enter the total in a single column in Part I. Enter “RIC” on line i. Total all foreign taxes passed through and enter the total on a single line in Part II for the applicable category.
Because computations for inclusions under sections 951A and 965 are reported on separate forms, Form 8892, Global Intangible Low-Taxed income, and Form 965, Inclusion of Deferred Foreign Income Upon Transition to Participation Exemption System, you don’t need to report those inclusions on a country-by-country basis. For inclusions under section 965, in the applicable category, enter the total in a single column in Part l. Enter “965” on line i. For inclusions under section 951A, enter the total inclusion in a single column in Part l. Enter “951A” on line i.
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