Migration data error from Test to Sandbox

[Vurukonda Sai 1]

Hello, 

We are migrating data from test to Sandbox. when preview the data we are getting multiple type of error. like this

Could not find a record in sc_cat_item for column cat_item referenced in this update

Could not find a record in sc_cat_item for column sc_cat_item referenced in this update

Could not find a record in sc_cat_item_delivery_plan for column delivery_plan referenced in this update

Could not find a record in sc_cat_item_producer for column producer referenced in this update

Could not find a record in sc_homepage_renderer for column homepage_renderer referenced in this update

Could not find a record in sn_cd_content_base for column content referenced in this update

Could not find a record in sn_ex_sp_external_link for column external_link referenced in this update

Could not find a record in sn_hr_core_config_case_creation_service for column case_creation_service_config referenced in this update

Could not find a record in sn_hr_core_topic_detail for column topic_detail referenced in this update

Could not find a record in sp_css for column sp_css referenced in this update

Could not find a record in sp_widget for column sp_widget referenced in this update

Could not find a record in sys_report_color for column axis_max_color referenced in this update

Could not find a record in sys_ui_policy for column ui_policy referenced in this update

Could not find a record in sys_update_set for column update_set referenced in this update

Found a local update that is newer than this one

This update has been skipped because there are multiple updates within the batch that are newer

Pls help me the above errors when to skip an error and when to accept it?