72(t)deals with a 10% penalty on early withdrawals with certain exceptions
(i)made on or after the date on which the employee attains age 59½,
(ii)made to a beneficiary (or to the estate of the employee) on or after the death of the employee,
(iii)attributable to the employee’s being disabled within the meaning of subsection (m)(7),
(iv)part of a series of substantially equal periodic payments (not less frequently than annually) made for the life (or life expectancy) of the employee or the joint lives (or joint life expectancies) of such employee and his designated beneficiary,
(v)made to an employee after separation from service after attainment of age 55,
(vi)dividends paid with respect to stock of a corporation which are described in section 404(k),
(vii)made on account of a levy under section 6331 on the qualified retirement plan, or
(viii)payments under a phased retirement annuity under section 8366a(a)(5) [3] or 8412a(a)(5) of title 5, United States Code, or a composite retirement annuity under section 8366a(a)(1) [3] or 8412a(a)(1) of such title
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So if you're not required to take RMDs, you can do what you like. if you don't meet one of the exceptions then there will be the 10% penalty. when you reach the age where RMDs must start the value of the accounts will be reduced by these earlier distributions. You would need to add the total value of both accounts to determine the RMD which can be taken in whole from either account or split any way you want.
