I think it is likely that the two James are the same person largely because there is no one else known.
I think that the information to prove it one way or the other is available if only someone had the time to look. Even flying to Dublin is cheap by English standards and it is something I would be prepared to do if only there was enough hours in a day. A lot of what I would like to do is probably on hold until I retire. Then I won't have the money to do it!!!!!! LOL