What are the differences between Fuel Catalyst and Fuel Additives

What are the differences between Fuel Catalyst and Fuel Additives?  First the definition of a catalyst is a substance that increases the rate of a chemical reaction doing at a lower temperature or a higher energy level without itself undergoing any permanent chemical...
Ferox Fuel Tabs
801 RACING Pulse
801 RACING
FEROX
FEROX
RENNSLI
Fuel Tabs EF
XFT
EFTabs
EF Tabs
GPM
Global Power Motion
Best Future
Power Tabs
PowerTabs
BestFuture
Best Future Power Tabs
BivoTabs
Bivo Tabs
Mascatalizador
Bivo
Bivo Hibrido
CleanBoost
Clean Boost Fuel Pills
Clean Boost Fuel Tabs
DPF additive
FAP additive
DPF aditivo
FAP aditivo
Clean Boost Pills
CleanBoost Pills
MPG CAPS
Cleanboost Fuel Pills
Clean Boost Pills
AFC Fuel Additives
AFC Fuel Catalyst
Algae-X Fuel Additives
Algae-X Fuel Catalyst
AFC-705
AFC-710
AFC-710 POWDER
AFC-805
AXI Fuel Additives
Fuel Borne Catalyst
Fuel-Borne Catalyst
FBC