You can't just go by "burr brown 192/24..", you have to know the DAC's model number, download the datasheet and compare the specs.
As far as I can tell from the Yamaha website, the RN 303's DAC is the ES9006AS so I don't know why you say it has a Burr Brown DAC.
Created by tradition and progress
ca.yamaha.com
View attachment 38710
The Modi 3 supposedly has the AK4490
www.schiit.com
The AK4490 chip has much better THD specs than the E9006 but implementation also matter so it is hard to tell but as others mentioned, you won't likely be able to hear the difference.