I made mine identical, can’t you?
FYI the forum isn’t a program made by Webflow. It’s a Discourse.org software. Plugins are possible and custom development too, but to ensure a continuous compatibilty, it may be tricky to hack down to the user login. You can see new features on the forum all the time, because that compatibility is respected. (in other words I don’t know about this but I hardly see that request be fullfilled anytime soon)