Index from restore larger than source index?

Hi, so I have 2 Elasticsearch cluster (A and B). I create snapshot from cluster A and then restore it to cluster B. I use 1 index replica on cluster A and in cluster B I change my index replica to 2. The result is like below.

cluster A on below and cluster B on above. As you can see, my restored index on cluster B has much bigger size than the cluster A, is it normal or I miss something here?

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