How are Black Adam and Shazam connected and why were films split

Black Adam released its first trailer this week which sparked the attention between Dwayne Johnson's DC character and Shazam.

Dwayne Johnson Fought To Keep 'Black Adam' And 'Shazam' Films Separate –

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Dwayne Johnson Reportedly Disapproves of Shazam And Even Removed Its Black Adam Scene

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Box Office: Black Adam' Powers To $25 Million On Friday – Deadline

Do Shazam and Black Adam have the same powers because a lot of forms, say Black Adam is stronger? - Quora

Black Adam' Proves Dwayne Johnson's Strengths and Weaknesses as a Box Office Draw - TheWrap

How Black Adam Is Related to Shazam