German 5 Pfennig coin vs 2 Pfennig coin. Why are they so similar?

5 Pfennig Coin From Germany

Mintmarks:
A Berlin, Germany
D Munich, Germany
F Staatliche Münze Baden-Württemberg, Stuttgart, Germany
G Staatliche Münze Baden-Württemberg, Karlsruhe, Germany
J Hamburgische Münze, Germany

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