Desigo and Cerberus PRO are Siemens’ two “daughter brands” that sell fire alarm equipment. The Desigo brand is sold directly through Siemens and is more proprietary, while the Cerberus PRO brand is sold through distributors and is less proprietary. They are exactly the same products, but with slightly different software. It’s kind of like JCI’s Simplex and Autocall brands, but they both use the same addressable devices. In my area, I’ve almost exclusively seen the less proprietary Cerberus PRO systems that are sold through distributors, except at a chain of Clinics and Hospitals that partners with Siemens Desigo for almost all of their fire alarm needs.
The updated version of the FireFinder-XLS is the Modular panel. It’s often referred to as a Desigo Modular or a Cerberus PRO Modular.