I'm following this tutorial http://docs.magento.com/m2/ce/user_guide/system/data-import-product-images.html to upload and assign images to product. I have successfully completed this process but i want to replace exiting images with new images. To replace images following CSV header is used to update images
sku store_view_code attribute_set_code product_type base_image base_image_label small_image small_image_label thumbnail_image thumbnail_image_label
But problem is instead of replacing images, Magento2 import process adds new image with old image.
(Similar issue with category update : https://github.com/magento/magento2/issues/7930)