Migrating from Oracle database to HANA database

We are migrating our data base from Oracle to HANA. Only the data base is getting changed. Not a full S/4 HANA migration. I would like to know if there are any major changes on CRM One order , Case Management , Business Partner and Address related tables. I am trying to understand what will be the impact on our custom programs which uses these tables. Since this is only a hard ware change from Oracle to HANA will there be any impact on our custom programs and custom tables.

Thanks.