Switches equivalence (mountain)

[Val]

Hello, 
I would like some help to define / understand some stuff about switches.I'm currently sourcing parts for R*S kits, and in their BOMs they advise to use Mountain Switch.Aside from the limited supply of these switches, I read that there's better quality switches out there, like C&K or NKK. But I don't really know how to do a product equivalence there... Last thing I need on my part lists.
The 3 references used: 
108-0042-EVX : https://www.mouser.fr/ProductDetail/Mou ... hB%2Fwug==
108-0043-EVX : https://www.mouser.fr/ProductDetail/Mou ... 5TQg%3D%3D
108-0044-EVX : https://www.mouser.fr/ProductDetail/Mou ... %2FQ%3D%3D
(hope links works fine)

Thanks for your help!