app/models/edition.rb in govuk_content_models-31.2.2 vs app/models/edition.rb in govuk_content_models-31.3.0

@@ -172,11 +172,11 @@
   # fields will likely be meaningless.
   def fields_to_copy(target_class)
     if target_class == self.class
       base_field_keys + type_specific_field_keys
     else
-      base_field_keys
+      base_field_keys + common_type_specific_field_keys(target_class)
     end
   end
 
   def build_clone(target_class=nil)
     unless state == "published"
@@ -338,7 +338,11 @@
     ]
   end
 
   def type_specific_field_keys
     (self.fields.keys - Edition.fields.keys).map(&:to_sym)
+  end
+
+  def common_type_specific_field_keys(target_class)
+    ((self.fields.keys & target_class.fields.keys) - Edition.fields.keys).map(&:to_sym)
   end
 end