I have denarius snap already installed so I add denarius_1 as above and this is what snap list shows.
snap list
Name Version Rev Tracking Publisher Notes
core 16-2.41 7713 stable canonical✓ core
core18 20191001 1192 stable canonical✓ base
denarius 3.3.9.4 77 stable carsenk -
denarius_1 3.3.9.4 77 stable carsenk -
to run the 2nd denarius daemon denarius_1
denarius_1.daemon
denarius_1 is now in the ~/snap/denarius_1 folder
~/snap$ ls -l
total 28
drwxr-xr-x 5 user user 4096 Oct 5 20:15 denarius
drwxr-xr-x 4 user user 4096 Oct 6 10:18 denarius_1
hint:
listen=0 and +1 to port and rpcport per additional daemon/QT
EZ-MODE