We are currently setting up a new website for a client. They old site is using CiviCRM Drupal 7. However the fields in the new site using CiviCRM in WordPress (Version 4.9.4) the fields of the database do not match. Is there a way to solve this backward compatability problem?
It is not allowing us to migrate the historical data to the new WordPress site by importing the data. Has any one an idea how we can resolve this, with out losing the historical data?