How to redirect custom post type posts to one url with htaccess?

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This answer from Webmaster StackExchange might be helpful:

RewriteRule ^products/ /page1/ [R=301,L]

Goes after the RewriteEngine and RewriteBase rules, but above all the other WordPress stuff.

If you don’t want to fiddle with the .htaccess, you can have a look at the Redirection plugin.