Thanks Stonechat - I doubt if either of these are the Thomas Rees we are looking for. For one thing we know he didn't have a middle initial - and he definitely wasn't a clerk. The other one is also unlikely as he was into tin & copper working, not carpentry. Thank you so much for your trouble though.
Since I posted that query, we have found that 3 of his brothers also emigrated to the US: William (c 1857) went over in 1892 on the Adriatic. At some stage he returned to Swansea, his home town - because in 1902 he was returning to the States as a US citizen on the Germanic. His brother John Rees (c1854)went out in 1894 and Thomas & brother Phillip(c1853) travelled over together in 1895 on the Saint Louis. We know that William & Thomas both eventually returned home to stay - not sure about the others. If you have the time, and could find any of them for us, we should be so grateful.