5 C.F.R. § 359.702
(a) An appointee covered by this subpart is entitled to be placed in a vacant civil service position (other than an SES position) in any agency that is—
(b) A probationary appointee, or a nonprobationary appointee who at the time of appointment to the SES held a career or career-conditional appointment (or an appointment of equivalent tenure, as defined in § 359.701(a)), is entitled to be placed in a position of tenure equivalent to that of the appointment held at the time of appointment to the SES. This tenure requirement does not apply—