I was running my server on 0.0.19.42 and forgot to update it when I went to update the mod, to 0.0.19.47. I did update the mod on my client and was able to join the server flawlessly. however the only issue that I encountered was that the Black Dogs and all Bewitchment Nether spawns weren't having a hitbox or model and would spam the logs saying that the game failed to render the model. But once I realized I didn't update the mod on the server, and updated it, I didn't have the issue with the dogs anymore. I am not sure if this was an issue with forge that I was running but it seems odd that I could join the server when I didn't have the same mod version.

Server:
OS: Ubuntu 16.04.6 LTS
Java: 1.8.0_212
Forge: 14.23.5.2814
Bewitchment: 0.0.19.42

Client:
OS: Windows 10
Java: 1.8.0_211
Forge: 14.23.5.2814
Bewitchment: 0.0.19.47

Logs:
https://gist.github.com/thakyZ/953b015793d906c3d43c94de5c2f42e3