Surprised to find Sue's post on the 1844 Baptism of Charles, son of Andrew. I could not find the birth, only listed on Census.
However Sue is correct, it is on the IGI as LYNDRY ( Looked for any Charles born IOM 1844), and Charles is a sponsor.
So a little evidence that they may be brothers, but I cant see how anyone on Charles side (b circa 1812) could be related to you as he does not seem to have any children - unless he left one in Ireland before he came to the IOM.

Cheers
David