You will likely lose most of your mods. Some of the Mods might already be included in the newer version of Web Wiz. you might want to look into this before changing anything out.. Always a lot of the mods only has to have inputted codes through out your site. Make sure you are making a back up first.
I would highly recommend upgrading to the latest version (since I don't know what version you are using) the latest features are better plus more security loop holes have been changed to the ever evolving internet.
You can always request someone to help you out with the Mods if you would like to get a newer version of that Mod.