The short answer is NO. This would be a lateral move at best, if that! IMO, N100 is better than Zen Mini. Having said that, to get the best out of N100; the quality of DAC, USB & PC cabling and rest of the system is just as important.
At moderately priced level, there are so many options to put together a decent sounding digital streaming front end. The devil is in the details. What have you done to optimize your Ethernet i.e. the connection between your router and streamer?