Buxus, dwarf or standard?

In March last year some buxus were planted. The weather wasn’t great and within a few months some went white so I replaced. The ones on the right of the picture are original, ones on the left replacements. When I bought the replacements I thought they were baby versions of the adult. Both sizes have grown so maybe the small ones will catch up (helped with trimming of the larger ones).
Are the plants on the left dwarf version of plants on right?
Are the plants on the left dwarf version of plants on right?

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but without the labels, it's difficult to tell. They certainly look slightly different from the older plants.