Hi there,
I had the thought that perhaps ... sailed from Sweden and transited to a different vessel at English Port... I can find info on NSW 1903 roll, perhaps there's Anders C with Frank... fingers crossed they were still at Macquarie St Mortdale etc.
Back shortly,
Edit to add ... Err, of course, his naturalisation papers must have been prepared after (or because of) enrolment requirements, but ... here's Elizabeth Mary Carlsson Macquarie-place, Mortdale, domestic duties... (NSW Electoral Roll 1903, Division of Lang, Polling place Oatley ... ... not sighted any others with that surname.
Cheers, JM