Can I create an extension with more than one panel of the same kind that show different html files?

[BarryCarlyon]

@retro

I can create two panels in the same extension

No an Extension can only have one Panel HTML Path.
And an extension can only be installed to a single Panel Slot.

@retro

Or does it need to be two extensions if I want two panels (of the same kind)?

if you want to display two different panels at the same time you would need two extensions.

And a broadcaster would be unlikely to install the same extension twice as it would take up 2 of the 3 available panel slots