Considerable size difference between mysql versions

We usually employ different MySQL versions for different scenarios. And I realized that similar databases, whith the same amount of tables and data, just because of different mysql versions differs in size from 43M to 223M. (~5x more) My goal is understand why of that 5x more disk space required.. Some version 5.5.46 have this size: du -hs /var/lib/mysql/ 43M And some 5.7.11 habe this size: du -hs /var/lib/mysql/ 223M Inside of it, we use to have those default datafiles like: ib_logfile0, ib_logfile1, ibdata1, mysql.. Within 5.5.46 thay usually have this sizes respectively: 5.1M ib_logfile0 5.1M ib_logfile1 26M ibdata1 6.5M mysql ..but within 5.7.11 are waaay bigger: 48M ib_logfile0 48M ib_logfile1 76M ibdata1 12M have also this ibtmp1 25M mysql In order to understand all that difference, I took a look to release notes where Oracle writes down what they're changing: https://dev.mysql.com/doc/relnotes/mysql/5.5/en/ But could not find something conclusive. I appreciate your help on that.