Both my grandfathers were named Don but they were different in almost every other way:
One was short and round, the other was tall and thin.
One was loud, the other was quiet.
One loved meat and cheese, the other loved whipped cream and marshmallows.
One was generous with his money, the other was stingy with it.
One drove a Cadillac, the other one drove a truck.
When introduced for the first time one took your hand and slapped you on the back, the other nodded and crossed his arms.
One was not born in this country. One had relatives who were early settlers.
Electric razor, straight edge.
I could go on and on, but there are a few similarities too:
Both had no friends (only wives’ friends, and family)
Both liked music
Both went to fancy New England Universities
Both were handsome in their 20s
Both studied people
Both were very organized