New answers tagged duplicates
The best way (if the duplicated images are the ones attached) is to order by date, and bulk delete all the older ones.
The Custom Post Types are probably set up with the Plugin "Types - Complete Solution for Custom Fields and Types" that is missing on the second install. According to their docs this plugin has an export/import feature. You can use it to export in the old install and then import the Custom Post Types in the new install.
There is no such thing as "URL that doesn't exist" URL's are just possible identifiers for pages on the internet. Every combination of characters as defined by the URL standarts is a valid URL. You can't control what URLs people are using to find content, if they want to use URLs for content that do not exist (and maybe can't even exist) you have no way to ...
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