Replication mdf and ldf size

I am using merge replication.But i found that mdf and ldf size are different at publisher and subscriber.Both database have same contents as merge replication(with push) is setup.

At publisher

mdf-45 MB

ldf-26 MB

At subscriber

mdf-78.9 MB

ldf- 68.1 MB

I saw this kind of difference for all databases which have merge replication.Why?