Well—that's exactly the case, and that's why you see different usage guides and dictionaries for American English and British English. "Correct" usage, for valu

Well—that's exactly the case, and that's why you see different usage guides and dictionaries for American English and British English. "Correct" usage, for values of correct that favor clarity for a given audience, does indeed differ substantially between American and British English, among many other variants and dialects. What has minimal effect is some international standards body trying to dictate usage. Today, and likely for a long time to come, if not indefinitely, "Turkey" is less distracting or confusing to practically any English-speaking audience one might choose, than the new thing. The new one's odd-enough looking (again, even just considering the letter order) and the old one enough entrenched that I expect the old form to be the better choice for communication in English for a long time.