Luitenant is the same as Capo, and New England has the same structure. Only one that is slightly different is the Outfit in Chicago. For the rest of the families, and past families it was the same structure.
Boss
Underboss / Consiglieri
Capo
Soldier
Associate

Sometimes, an associate or soldier can have more power than a capo. Some soldiers can be in direct contact with the boss, even associates.