Transfer from T2 to T1 Guangzhou Baiyun airport

Moscow - GZ (7 hours) - Phnom Penh. Have direct International flight Moscow Aeroflot to T2 Baiyun GZ and next international flight Shenzhen airlines departure from T1 Baiyun GZ. Have only hand luggage. How can I realise transfer transit from T2 to T1? Need do immigration control or this transfer inside transit zone ? Possible make new check-in inside transit zone by Shenzhen airlines?