They're saying the same thing in two different ways. Output voltage is one of the specs. They may not meet output voltage. Therefore...

These tiny modules are all just open loop choppers, so the output is just whatever you get, and also proportional to input. Or if they're regulated, they may be primary-side regulated, so the secondary does whatever.
Filter values will be similar for all models, and yes, suited to different voltages. Mind that both differential and common mode filtering are likely needed.
Tim