Whilst that was possible years ago it's no longer supported as the KonaKart schema has changed so much from the osCommerce schema.
However... What you could do is to install the latest KonaKart and create migration scripts to transfer your data from osCommerce to KonaKart which shouldn't be too hard because the tables will be very similar.
However... What you could do is to install the latest KonaKart and create migration scripts to transfer your data from osCommerce to KonaKart which shouldn't be too hard because the tables will be very similar.