Do you mean, change the default providers?
Update tbl_exchanges set f_provider = (select id from tbl_processes where ref_id = 'here the ref_id of your process') where f_default_provider in (select id from tbl_processes where name like 'and here your names that you want to replace%')
This of cource can change your database entirely, so make a backup first. You can also ask us for more formal advice, there are also more possibilities (filter the processes where the replacement is done, e.g.). Good luck!
- afterthought: this assumes that the existing product is provided by the new process, which you should check too