Where are Germany's heavy cruisers during Norway?

Do Germany's heavy cruisers join the standardized capital-ship group during the invasion of Norway?

No; they remain on their separate historical invasion missions while the added ships reinforce the Scharnhorst and Gneisenau force.

The common-hull scenario adds ships to the historical Scharnhorst and Gneisenau mission; it does not gather every German major combatant into one formation. Heavy cruisers remain assigned to separate Norwegian invasion groups and coastal objectives. That preserves the risk of ships such as Blücher operating in confined waters around Oslo rather than replacing them with a Scharnhorst-class unit. Germany's impressive central force still depends on dispersed operations elsewhere along the coast.