No, just as a Traditional IRA and a 401(k) are not the same thing, a Roth IRA and a Roth 401(k) are not the same thing (although they do have some characteristics). Your Roth 401(k) contribution is listed in Box 12 of your W-2, and is reported by entering your W-2. That's all you have to do for your Roth 401(k).
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