(I'm asking for roman catholicism, but you can answer eastern or other full communion's if you want.)
The Philippines differs from other Catholic countries in that Filipinos or well anyone gets married in the Philippines and wishes to be annulled in the Philippines is required to get an secular annulment (or foreign secular divorce. not sure.) before applying for a church annulment. In other countries, this requirement relaxed to a secular annulment OR a (local) secular divorce (again: or foreign secular divorce. not sure.). Therefore, poor Filipino Catholics who cannot go abroad to get a secular divorce and then a secular annulment. This unfortunate situation for Filipino Catholics is ironically because the Philippines doesn't have divorce because of Catholic reasons.
But this doesn't matter IF Philippine secular marriage/canon laws accommodate all of Catholic marriage/canon laws. It seems that the former accommodates at least almost all of the latter. (But still! Even if there's a single unaccommodated case, then there's the question of the poor Filipino Catholics who are invalid church married but valid secular married).
I'll repeat that the above has an 'ostensibly' attached.
Question 1: In general, how do Catholic marriage laws differ by region?
Eg there's a sufficient condition that makes a Japanese Roman Catholic marriage void/able that doesn't apply to French Roman Catholics or to German Eastern Catholics or whatever.
Eg there's a loophole that allows a Roman Catholic marriage conducted in Argentina to be void/able if the couple seeks an annulment in Scotland, whereas the marriage would've been otherwise 'valid' (as in not necessarily invalid) from the viewpoint of Argentinian diocese or whatever.
Eg the consummation rules are somehow different. (Maybe certain positions don't count in Ireland. IDK.)
If there are a lot, then well I find this insane since we're talking about a single denomination here, but ok, please say a few differences. (eh the lent and holy days of obligation already differ. I don't expect zero differences. I just expect there to be not so many differences.)
I attended a Catholic university in the Philippines, and we were required to take a course that included some canon law stuff like necessary or sufficient conditions for a marriage to be sacramental/consummated/void/able/invalid/whatever. I don't recall there was any mention of the regions to which these were applicable like 'applies to the Philippines but not necessarily to other countries'. I just assumed they were applicable everywhere.
- Re canon vs marriage: Okay so the term I seem to be looking for is 'matrimonial law' a subset of 'canon law'. Idk. I just remember from that class that catholic laws related to marriage and stuff are under 'canon law'.
Question 2: How are Catholic marriage laws regionally affected by local laws?
Eg Because of certain laws in South Korea, Catholic marriages have or don't have a certain requirement expected of Catholic marriages elsewhere.