to him or her under this section when he applies for a readjustment allowance and is determined to be entitled to such allowance. If such training allowance paid to such worker for any week of unemployment is less than the amount of the readjustment allowance to which he would be entitled if he applied for such allowance, he shall receive, when he applies for a readjustment allowance and is determined to be entitled to such allowance, a readjustment allowance for such week equal to such difference. (d) Election of transition adjustment allowance or unemployment insurance Notwithstanding section 201(a)(3)(B), an adversely affected worker may elect to receive a readjustment allowance instead of unemployment insurance during any week with respect to which the worker— (1) is entitled to receive unemployment insurance as a result of the establishment by the worker of a new benefit year under State law, based in whole or in part upon part-time or short-term employment in which the worker engaged after the worker's most recent total separation from adversely affected employment