Is this a modpack or mod issue?
Modpack

PLEASE MENTION IF YOU ADDED ANY MODS.. ESPECIALLY SODIUM, IF YOU DON'T, IT MAKES US VERY GRUMPY
No

Modpack Version
2.8.1

Describe the bug
When I install the latest server pack and try to join the server I get the Error "Registry remapping failed: Recieved ID map for Minecraft:sound_event contains IDs unknown to the receiver!"

To Reproduce
Steps to reproduce the behavior:

1. Download the modpack
2. Download the server pack
3. Run server starter to install the mods and start the server
4. try to join
5. see the error message

Screenshots
https://img.steinh.art/KuNOLPs.png

Logs
Client: https://paste.alloffabric.com/osomilomod.yaml
Server: https://paste.alloffabric.com/ibanisomom.yaml

Your client and server version are not the same. Make sure both are running the same version of AOF. This is literally the problem.. so please double.. triple check everything.

I had already double checked that by reinstalling it.
I imported the zip manually and that seemed to work