Idk if 2 jars will work, maybe 3 or more to spread aggression. 2 jars will fight all the time and one might end up dead due to getting beat up and stress.
You can but be prepared to seperate if hell breaks loose, sometime it will work and sometime it will not. Really depends on the fish attitude its really a gamble especially with jardini. Another question is can you provide a huge tank if you decide to go that route?