How can I change an anim blueprint to another in C++?

Development Character & Animation
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2

You have to use following code to change animation blueprint. This function also changes animation mode to the BlueprintAnimated

SkeletalMeshComponent->SetAnimInstanceClass(AnimBlueprint->GeneratedClass);

Full code to change both skeleton and anim BP (taken from the actor factory)

	// Term Component
	NewSMActor->GetSkeletalMeshComponent()->UnregisterComponent();

	// Change properties
	NewSMActor->GetSkeletalMeshComponent()->SkeletalMesh = SkeletalMesh;
	if (NewSMActor->GetWorld()->IsGameWorld())
	{
		NewSMActor->ReplicatedMesh = SkeletalMesh;
	}

	// Init Component
	NewSMActor->GetSkeletalMeshComponent()->RegisterComponent();
	if( AnimBlueprint )
	{
		NewSMActor->GetSkeletalMeshComponent()->SetAnimInstanceClass(AnimBlueprint->GeneratedClass);
	}