On Asus website there is no Zenfone 8 charger listed at the moment, only the "ROG 30W USB-C adapter".
Is this the same charger auitable for Asus Zenfone 8 too?
What is your country?
p/n of what you are looking for is 0A001-00831800 (ADAPTER 30W 5V/3A 2P BK TYPE C)
at least it's suitable for RU users.
You may use the ROG 30W. It will work interchangeably with the Zenfone 8 one.