Flutes etc. Sarrusophone alto and rothophone alto same Reed or not

[jcn664]

Hello, i will have rothophone alto or sarrusophone alto, but i didn't know how can choose, and i want to learn the double Reed but keeping the fingers charts of saxophone to begin it will more easy for me.

After, i asking question, if i change rothophone in sarrusophone, i can keep my double Reed or it's two different double Reed

And it has level of double Reed as same as saxophone Java 2,5... Etc. Or not