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Ну, если лезть в этимологию - то да. "Вчера" изначально было творительным падежом от слова "вечер". :)

It's true. It's easy to confuse вчера and вечера, if you're a beginner.

The best way to tell the difference is that the word вчера never changes its form. :) So if you see some extra letters (or some letters are missing) it's most likely another word. ;)