Работаем с Customer ID не именами пользователей. Попробуй по аналогии.

RewriteEngine On

  RewriteCond ${lowercase:%{REQUEST_FILENAME}} ^/(m)-([0-9]+)/$
  RewriteRule ^/(.*)-(.*)/$  /?custId=$2&page=Business-Features-Map [P,L]

  RewriteCond %{REQUEST_FILENAME} ^/([0-9]+)\/([0-9]+)/$
  RewriteRule ^/(.*)/(.*)/$ http://url.com/?page=Business-Customer&custId=$1&headingCode=$2 [P,L]