First, is the other dimmer a zwave device? If not this method won’t work. Also, if it’s a newer zwave device that uses “s2 encryption” association probably won’t work either.
Take a look at this thread for a good overview of associations . There are advantages and disadvantages to it. FAQ: Zwave Association between 2 devices
See this post higher in the thread for how to program it if you want to give it a try. [RELEASE] GoControl Smart Wireless Light Switch WA00Z-1