NP, @puravidapto.  I only just noticed you're referring to preparation fees.  I wouldn't think 1065 is a fair comparison for a few reasons:

1) The number of schedules that may need to be completed differ depending on which categories your client belongs to;

2) Additional time and effort will likely be incurred for understanding, reviewing, and analyzing books and records kept in foreign standards; and

3) Translation from whatever FRS the foreign partnership uses to US GAAP may entail engagement of dual-practice accountants overseas.