I believe the stock nozzles are brass but they should be replaceable.
Tricky part will be to ensure that they are both “level” as unlike the TAZ Pro, they do not move. See https://forum.lulzbot.com/t/v3-dual-nozzle-height/5674/4
This might also be helpful, https://ohai.lulzbot.com/project/dual-extruder-v31-tool-head-assembly/
Since the nozzles are listed as “E3D Dual V3 Hot End” I’d guess that you can source the nozzles you want from E3D.