Who told you Dyckias in nature are just like soldiers of the very same army, 
once you saw one you have seen all?
The differences are like tickets to their salvation,  tickets to heaven... a way to Paradise.
If every one member of a very same species presented any and no difference this species would be condemned to extinction, for nature is always changing mind and a perfect population of the very same species would have no way to come up with an answer to the challenging  environment.
Perfect or not the population would die, be vanished.....
Every population of perfect individual are condemned to extinction.
Perfection seems to be differences hints scattered among the individuals of a very same species.

.