I moved all tables from your post.
I deleted address book, customers, customer_basket, customer_info and then renamed those same 4 to the marvikshop table names.
When I checked the Customers Page in MarvikShop, I get the following error.
1054 - Unknown column 'c.customers_group_id' in 'on clause'
select count(*) as total from aw4gd_osc_customers c left join aw4gd_osc_address_book a on c.customers_id = a.customers_id and c.customers_default_address_id = a.address_book_id left join aw4gd_osc_customers_groups cg on c.customers_group_id = cg.customers_group_id
And when I add customers_group_id to the customers table, I get this error now. This move process is ridiculously difficult.
1054 - Unknown column 'c.customers_group_ra' in 'field list'
select c.customers_id, c.customers_lastname, c.customers_firstname, c.customers_email_address, c.customers_group_id, c.customers_group_ra, a.entry_country_id, a.entry_company, cg.customers_group_name from aw4gd_osc_customers c left join aw4gd_osc_address_book a on c.customers_id = a.customers_id and c.customers_default_address_id = a.address_book_id left join aw4gd_osc_customers_groups cg on c.customers_group_id = cg.customers_group_id order by c.customers_id DESC limit 0, 20