ConvaTecNatura Drainable Opaque, Standard 57 mm Pouch with InvisiClose and Filter (2 1/4 in)

I'm buying for my dad and I'm confused. Is natura and combated the same?do they work with coveted skin barriersas long as they're both 57 mm?

is this ref 416420?

Is this pouch 2-sided or 1-sided?

Does this pouch have the filter?