There will be several parallels when it comes to things like resource management and warfare, and the Wonders system also appears to be the same as in Civ 6, at least on a fundamental level.

As for Civ 6, its single and double civ DLC releases ... two leaders, and four natural wonders On paper, it seems like it's more, but with Civ 7's change to how leaders and civs work, people ...