i have got a solution
this module have some dependencies
after install this module go to for the configuration
url: /admin/config/content/node_export
select the file type which is easy to edit for you i think JSON is a good option then save with JSON selected
Export your nodes:
Go to the : /admin/content then filter with your content type which one you need to export like content_a
select all node and select option "node export" from "Update options Operation"
i know there is only fifty nodes you can do this by multiple time or combine all export file into one file for import later
Now we have all node exported in file mode
you have to change the type field value from this exported file
you can do this by converting this file into easy editable type like
if you export data into json format then convert it in csv file
you can do this online from
and the change field value type to your new content type
like "type" column has value "ContentA" change it to your content type name where you want import these contents like "ContentB"
then revert this csv file to json format
Now we have to import data in to drupal
Go to : /node/add/node_export
select you exported file and then import
and DONE
for new content type where we want import these content you have to create new content type manually with same field all fields setting and name should be same
it should not get your too much time :)
And you are done
i have tested this form you works fine
HOPE THIS SOLVE YOUR PROBLEM
THANKS
ContentB
content type doesn't have the fields in it definition? – Syscall