It seems impossible that these would be accounts under separate plans; there cannot be a Roth 401(k) that does not have a traditional 401(k) account associated with it because employer matching or profit-sharing contributions are permitted to be made only to the traditional 401(k) account, not the the Roth 401(k) account. Review the trust agreement that you adopted when creating the 401(k) plan.
If you are eligible to take a distribution from the 401(k) plan (i.e., you are over age 59½), you also have the option to do a taxable rollover from the traditional 401(k) account to a Roth IRA. (In this case, the taxable amount would be subtracted from AGI when determining your MAGI for the purpose of a separate Roth IRA contribution if you were to make one.) To avoid mandatory tax withholding you need to do that rollover as a direct rollover, not an indirect 60-day rollover.
