In either version of the movie, no one cares or talks much about the destruction of the Republic capital.
Which makes me believe it was a late addition to the plot (pretty sure it wasn’t Kasdan idea nor a recycled Lucas idea from his treatment, it bears the mark of JJ Super 8 Abrams). For instance no one says “we’ve tracked where the energy source came from, so we know where SKB is”. So indeed it’s implied that Finn provides the knowledge and the location of SKB. Problem solved !