My assumption is that you could mix 301 and 404 lines in .htaccess files so that you can redirect specific pages and then use a 404 redirect to mop up the rest to a custom 404 error page.
But seemingly not?
My assumption was something like that below, but no it doesn't seem to like it.
Redirect 301 /1.htm /a.htm
Redirect 301 /2.htm /b.htm
Redirect 301 /3.htm /c.htm
Redirect 404 /custom404.htm
Am I going about this in entirely the wrong manner or is the objective just not possible, its 301 or 404 but not both?