In my opinion such coincidence isn't surprising at all as such words as "extra" and "bit" meet very often in the sphere of cryptocurrencies. I didn't begin to do hasty conclusions.
We are not talking about names here, it's same company, because they share the same Company number 10929612 and address
here is the information about extrabit.biz in this link and here is the link to certificate of incorporation that belongs to extrabit.io here
=> same company number 10929612 + same address ( 35 Ballards Lane, Finchley, London, United Kingdom, N3 1XW ).
This should really be clarified by the dev and the team so that people's mind would be clear. This is not a coincidence because of they have the same data and probably problem like this should be fixed as soon as possible.