Moving Gutenberg content from one website to another (block media ids wrong?)

The obvious result of an incorrect media ID is that it cannot find the image (because it’s not in the media set).

One way to work around this, is to set up your images on the old site as url’s instead of media items. I’m sure this is not the only and definitely not the best solution. However, it works for me. (Select “Insert from URL” instead of “Media Gallery”. The url’s for each image are shown in the “Copy Link” field when you select the image in the media gallery). However, this means that the image have to remain available on the old website.