quesiton; multi server network?

[Merith-TK]

My server network has a Purpur, Fabric, (1.20.4) and soon to be if this mod works out, forge server (1.12.2)

Will this work as a drop in addon to my system?

[p0t4t0sandwich]

It should work with Forge 1.12.2 yeah.
For anything Forge 1.13+ you need to use Velocity with Ambassador

[Merith-TK]

Was meaning as <1.12.2 AND >1.13 servers side by side

[p0t4t0sandwich]

Yep, though only if you use Velocity, Ambassador, and Legacy/BungeeGuard forwarding.

Edit: if you want Forge 1.13+ you need Ambassador, otherwise as long as you're using BungeeCord/Legacy forwarding it should work fine with Forge 1.12.2 and below