Difference between "Add to Project" & "Create Project" contents in UE?

After downloading Unreal Engine content from Epic Games launcher, why in the UE library some content (Architectural Visualization, Environments, Blueprints etc) have the option to “Add to Project” [for eg Downtown west modular pack, Edie Room, Vehicle Variety Pack etc] while some other have the option to “Create Project” [for eg Big Office, Factory Environment Collection, Vehicle VarietyPack Pack Volume] ? Whats the differences due to which UE classifies them as such and what are the differences in the usages of these 2 type of contents?

Often, the ‘create project’ assets rely upon certain project settings, and they don’t want to go ‘tinkering’ with your current project without permission.

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Thanks for sharing your views :hugs: