No, not exactly.  There is a subtle distinction between a "designated Roth account" and a "Roth IRA account."  A designated Roth account is one associated with a 401(k), 403(b), or 457(b) plan.  There are both advantages and disadvantages of a designated Roth account compared to a normal Roth IRA account.  A good description from the IRS website is at:
   https://www.irs.gov/retirement-plans/designated-roth-accounts-contributing-to-a-designated-roth-acco...