I didn't mean for it to sound as if they match. I just meant that they look to have very similar "elements"

Wisdom exists for both albeit through different sources. In Vito's case, it was internal (intelligence). While in Tony's case, it was acquired (through external inputs of friends and relatives).

The analogy of the blood-relatives relates to Chris being compared to Sonny, Fredo to AJ, and Mike to Meadow.

Chris, even though he's not a son, is as reckless as Sonny (possibly even more).

AJ is as ....well-I-can't-find-the-words... slow and as irresponsible as Fredo.

Finally, Med is as smart, quick, strong, & discreet (remember her defending remark aimed at Jackie Aprile Jr.'s sister at Jackie's funeral even though she believed her father okeyed the hit) as Mike.