I haven't found anyone whio looks like him in Scotland on the 1841 census. There's a possible in Bury, Lancs but he's a draper, living with a few others b. Scotland. I'll put it up here but am not convinced it is him:
Garden St, Bury HO107 Piece 538 Book 13 Folio 25 Page 1
I think it's a multi- occupied house. The first listed is a William Johnson, silk dyer, b. Foreign Parts but it looks as if this might be a separate household:
John Johnson, 35-39, Draper, b. Scotland
Robert Johnson, 25-29, draper, b. Scotland
John Lowden, 25-29, draper, b. Scotland
Elizabeth Murry (?), 35 -39, Female servant, b. Scotland
Margaret Hume, 40-44, Independent, b. Scotland
Gadget