Greetings @C.Saket,
As the name Arahant imply that when the Arahant passes away they will not be in this world of 31 realms, so all other questions are not relevant except “What is the difference between the two ?”
The different between Panna vimutti and Cheto vimutti is as stated below:
vimutti：’deliverance’，is of 2 kinds：deliverance of mind （ceto-vimutti，q．v．） and deliverance through wisdom （paññā-vimutti，q．v．）．
The best example is the two chief deciples of the Buddha, Ven. Sariputta (by panna vimutti) and Ven. Mongallana (by cetto vimutti). The main difference is in the method of bhavana where one gained liberation through wisdom (panna vimutti) and the other by cessation of mind (cetto vimutti).
With Metta,
Seng Kiat