Help needed on Apache .htaccess ErrorDocument

(please excuse my broken apostrophe key, it shows up as ´)
I have two entries in my root .htaccess . They are:
ErrorDocument 403.4 /error_pages/403.4.html
ErrorDocument 403.6 /error_pages/403.6.html

Any time a 403 error is produced it always gives the 403.4 error page. I don´t think I am doing anything wrong, please help.

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