Had a task of copying all the settings from one theme to the other, bock placings and configuration to do that this code snnipet run with drush solved it
**FIRST**
drush sql-query "DELETE FROM block WHERE theme = 'some_theme_2'"**SECOND**
drush sql-query "INSERT INTO block (module, delta, theme, status, weight, region, custom, visibility, pages, title, cache, i18n_mode) (SELECT module, delta, 'some_theme_2', status, weight, region, custom, visibility, pages, title, cache, i18n_mode FROM block WHERE theme = 'some_theme')"