Change Subdomain PHP Version 7.3 Doesn't Work

Hi, community!

I tried to change the PHP version via directory using the code below, but it doesn't work. I noticed that it doesn't just work with php 7.3, all the others: 7.0, 7.1, 7.2, 7.4 and even 8.0 works fine. Someone can say me why?

Code used:
<FilesMatch ".(php4|php5|php3|php2|php|phtml)$">
SetHandler application/x-lsphp73