No — they answer different questions. Ethnicity percentages come from autosomal DNA and blend all your family lines over recent generations. mtDNA follows just one line, deep into prehistory. An mtDNA result pointing to one region and an ethnicity estimate pointing to another aren’t a contradiction; they’re two different views of your ancestry, and both can be true.
Is my mtDNA result the same as my ethnicity or ancestry percentages?
No — mtDNA follows one deep line while ancestry percentages blend all your lines. Both can be true at once.