Joel Embiid and Ben Simmons are both technical rookies (at least, if Simmons doesn’t sit out for the entire season). They definitely don’t have the same background, but they are two of the four rookies that are debuting for the Sixers this season.
Because of that immediate similarity, the two of the Sixers got along well almost immediately once they got together in Philadelphia. They clearly gel as friends, and seem to have already sparked a brother-like relationship.
It’s not that far off of an assumption based on interactions.
On Twitter, the two of them can often be seen taking playful jabs at each other on a regular basis.