The functionality is there, but it can be hit or miss. I believe it has to do highly with ping.
PVP: Can sometimes be client-side only, but other times not. It can work though.
PVE: Much higher chance of working. Still ping dependent though. Most of the time, as long as the players can see the person initiating the parry bash, then it will normally sync.
Additional Information
Even when it doesn't sync, the NPC will not be able to attack as if he was in the stagger animation. Would not recommend for PVP.
Mod information
SKSE plugin that replaces vanilla Skyrim's bash with a parrying mechanism to spice up Skyrim's combat.
Download link
https://www.nexusmods.com/skyrimspecialedition/mods/70240
Dependencies
Compatibility
The functionality is there, but it can be hit or miss. I believe it has to do highly with ping.
PVP: Can sometimes be client-side only, but other times not. It can work though.
PVE: Much higher chance of working. Still ping dependent though. Most of the time, as long as the players can see the person initiating the parry bash, then it will normally sync.
Additional Information
Even when it doesn't sync, the NPC will not be able to attack as if he was in the stagger animation. Would not recommend for PVP.