If you get one male and three females, yes.
Two of each, maybe.
But all males may be pushing it.
I love dwarf gouramis I have one lone male, I did have two males one got sick and died, I think the stronger one killed him to be honest, but my little lone ranger it going great, such a funny little fish to watch.
The cardinals are about the same size as the neons I think given the space they can reach up-to 2 inch, but as I said previous my biggest is maybe 1,1/2 inch, he's the boss.