Can PgSqlException and NpgsqlException be used interchangeably?

[DeafSmith]

I have some sophisticated error trapping using NpgsqlException .

But many of my SQL reads are in Postgresql and use PgSqlException for error trapping.

So, instead of using:

catch (PgSqlException ex)
            { MessageBox.Show(ex.ToString()); }

I want to use

catch (NpgsqlException ex)
     {
      string errorx = UsefulTools.error_list(ex.Code);
      MessageBox.Show("Error in reading table for reason " + errorx + "\n");
      }

And in my 'UsefulTools.cs ' I have a rather long list of error codes and what they mean.

So, will that work? Can I use NpgsqlException instead of PgSqlException?

Thanks!