> Accents that have resisted the merger include most Scottish, Caribbean, and older Southern American accents as well as some African American, modern Southern American, Indian, Irish, and older Maine accents.
If my understanding is correct, in some accents that don't pronounce their "R"s at the end of words, the vowel shape changes slightly while pronouncing "four," but "fore" is pronounced with a simple vowel.
[1] https://en.wikipedia.org/wiki/English-language_vowel_changes...