Revis_Island this is not true,even if Calabria and Sicily border each other they were different as for dialect that for the other things (Im italian and can say the difference between the two dialects) for the oc the Calabrians was focused until the 1990 on the kidnappings and after when the mafia declared war to the italian state,the ndrine used the bilion that made with kidnappings for replace cosa nostra in drug trade.
The sicilians for example considered the ndrangheta as the gambinos considered the decavalcante aka a peasants because they were only focused in blood ties and had no International links.
That wasnt true and cosa nostra had to ask help for save their men that was in narcos hands because have no money for pay the drug.
Its hard to explane but the proximity is only physical for the rest there is a huge abyss that divides them.