Not really.
Sure, there are loads of Scottish and Irish ex pats or second / third generation fans around the world. But, in global terms, their number is but a drop in the ocean.
They also have a massive fan base in Scotland, of course. But they play in the SPL. And the world isn't remotely interested in the SPL. So other than temporarily, because of a player like Nakamura, for instance, Celtic don't attract significant support in Asia, Europe or Africa.
By contrast, Spurs play in the Premier League - the most popular domestic league in world football, which enjoys a phenomenal global profile. And Spurs is one of the biggest and most exciting of Premier League clubs. Our global fan base is consequently growing rapidly.