How to make any custom script work on centminmod : problem with nginx rewrite rules

Hello, i use centminmod since 2 years but every time u have to use custom script from some code market seller, I have to put them inside a very slow shared hosting with Cpanel because it works only there. why? Everybody use apache and not nginx.

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Please can someone explain to me the methodology to convert for example this apache code to Nginx :

Code:

# BEGIN Spark
Options -Indexes -MultiViews +FollowSymLinks
AddDefaultCharset UTF-8

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP:Authorization} ^(.*)
RewriteRule .* - [e=HTTP_AUTHORIZATION:%1]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$  /$1 [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [QSA,L]
</IfModule>

<IfModule mod_deflate.c>
<FilesMatch "\.(html|php|txt|xml|js|css|ttf|otf|ico|json|svg|)$">
SetOutputFilter DEFLATE
</FilesMatch>
</IfModule>
# END Spark

is this nginx code correct ?

Code:

# Most installations will have a default fastcgi_params file setup that you can just include as shown above. Some configurations don’t include the SCRIPT_FILENAME parameter. You must ensure you include this parameter otherwise you might end up with a No input file specified error from the fastcgi process. This can be done directly in the location block or simply added to the fastcgi_params file. Either way it looks like this:
# fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;

server {
    listen       80;
    server_name  www.mysite.com mysite.com;
    root         /path/www.mysite.com/public_html;

    try_files $uri /index.php;

    # this will only pass index.php to the fastcgi process which is generally safer but
    # assumes the whole site is run via Slim.
    location /index.php {
        fastcgi_connect_timeout 3s;     # default of 60s is just too long
        fastcgi_read_timeout 10s;       # default of 60s is just too long
        include fastcgi_params;
        fastcgi_pass 127.0.0.1:9000;    # assumes you are running php-fpm locally on port 9000
    }
}