The two definitions are different
Foamed silica gel: As the name suggests, this foaming method uses pure natural rubber as the main material, then adds some other auxiliary materials, adds a specific foaming agent, and obtains the corresponding product after a certain process.

EVA foam: It is a raw material produced by the copolymerization of ethylene (E) and vinyl acetate (VA). It is solid at room temperature, but it will become a liquid with a certain viscosity after being heated at high temperature.

About foamed silicone, please check the details:
https://www.siliconefoam.net/product-medium-firm-silicone-foam-iota-ht-800-.html