Here is the guideline for charging a different amount for different post types.
1) Navigate to wp-admin > User Frontend > Subscription. Click on Add New Subscription button to add new subscription.
2) Now, You can see the fields to enter the number for each post.
3) If you want to allow only one post type for that pack then enter the number for that post type field, keep value 0 for other post types.
3) Click on “Publish” button to publish that pack.
All done, now users can only submit to that specific post type after purchasing this pack.