No. Toujeo isn’t the same as Lantus, but they’re very similar. Both Toujeo and Lantus contain the same long-acting insulin, insulin glargine. But Toujeo contains 300 units per mL of solution, while Lantus contains 100 units per mL of solution.
This means that Toujeo is more concentrated than Lantus is. Because of this, you should never use one medication in place of the other.