I wouldn't do it unless your tank is bigger than 6' by 2' wide if you value both the jags and dovii. Parachromis hate each other's guts and the fact that you're dealing with pairs makes it even worse.
well i currently have thw jags in a 55 gallon, the dovii's in a 20 gallon, and another 55 with my red devil and rd flowerhorn, i will be getting a 120 gallon which is a 6x2 so i think ill wait to put them in the new tank
one no 120 is 6x2 and second depending on size you will end up with a red devil or a dovii just my thoughts i have two jags and two dovii in a 240 8x2x2 and they do not get along well