Firespitter / Interstellar Fuel switch

[Gordon Dry]

Do I really need both?

One mod's description says it needs Firespitter as dependency, another mod's description says it has to be Interstellar Fuel Switch ...

Then I read this

Quote

REQUIRED Dependencies: (version 1.0+)

• ModuleManager
• Interstellar Fuel Switch (Core-only is OK). (Firespitter will also work)

at

and I also read this:
https://github.com/KSP-CKAN/NetKAN/issues/1981

and this:

So there is also B9PartSwitch in question now ...

Could please anybody enlighten me which functions are the same used by the three different mods and which are different?

Is it possible to only use Firespitter also when a mod wants Interstellar Fuel Switch or vice versa?