Transfer at Shanghai Pudong Airport from Japan Airlines to China Eastern (Intl to Intl)

Hello there!

Australian passport holder.

I am arriving on a Japan Airlines flight at 21:45 from Tokyo, then transferring to a China Eastern flight at 00:05 to Singapore.

I will only have cabin baggage, no checked baggage.

Is 2 hours and 20 minutes enough time to transfer and do I need to go through immigration to transfer between these flights?

Does China Eastern have a transfer desk in Terminal 1 where I can collect my boarding pass for the PVG-SIN flight?

Thank you in advance!