I have an existing installation of Apache (2.2.10 Windows x86) using mod_php and PHP 5.2.6. Can I run another site in a virtual host using FastCGI and a different version of PHP, while stilling running the main site in mod_php?

I've made an attempt, but when I add my FCGI settings to the virtual host container, Apache is unable to restart.

httpd.conf mod_php settings:

LoadModule php5_module "C:\PHP\php-5.2.17-Win32-VC6-x86\php5apache2_2.dll"
AddHandler application/x-httpd-php .php
PHPIniDir "C:\PHP\php-5.2.17-Win32-VC6-x86"

httpd-vhosts.conf fastcgi settings:

<VirtualHost *:80>
    DocumentRoot "C:/Inetpub/wwwroot/site-b/source/public"
    ServerName local.siteb.com 
    ServerAlias local.siteb.com 

    SetEnv PHPRC "C:\PHP\php-5.3.5-nts-Win32-VC6-x86\php.ini" 
    FcgidInitialEnv PHPRC "C:\PHP\php-5.3.5-nts-Win32-VC6-x86" 
    FcgidWrapper "C:\PHP\php-5.3.5-nts-Win32-VC6-x86\php-cgi.exe" .php  
    AddHandler fcgid-script .php  

</VirtualHost>

<Directory "C:/Inetpub/wwwroot/site-b/source/public">
    Options Indexes FollowSymLinks Includes ExecCGI
    AllowOverride All
    Order allow,deny
    Allow from all
</Directory>