Is LEGO Skylines the same as Cities: Skylines?

Is LEGO Skylines a Cities: Skylines expansion?

No. Paradox's official FAQ states directly that LEGO Skylines is neither Cities: Skylines DLC nor Cities: Skylines III. It is a separate title developed by Iceflake Studios and published by Paradox Interactive.

Why do the names sound related?

Both names identify city-building games associated with Paradox, but LEGO Skylines has its own visual world and a stronger stated focus on flexible LEGO-style customization. That similarity alone should not be taken as proof that both games share code, modding APIs, economies or controls.

Will gameplay be identical?

There is not enough confirmed, finalized detail to answer that. The LEGO game is described by the publisher as a cozy, approachable city builder: you manage infrastructure and make individual neighborhoods your own. The official overview mentions electricity, food, water, workplaces and public services.

When gameplay and systems documentation become public, this page can compare specific mechanics and interfaces. Until then, claims about identical road tools, simulation depth or asset compatibility would be speculation.

See also what LEGO Skylines is and confirmed release information.