Redshift table uses 75GB of disk while the equivalent table on Mysql uses 40GB

The below query returns 75GB on redshift while on mysql the equivalent query returns 40GB. select size from svv_table_info where "table"='table_name'

I always assumed redshift saves on disk space by sorting and distributing data in blocks and not having indexes.

What may be the reason for the differences that i missed? I checked that :

1. there are no missing rows or columns on Mysql
2. Redshift table is vacuumed regularly