You gotta be real careful with the foreign ones. They have alterior motives for wanting to marry you because of the citizenship they want. My cousin found a chick from Ukraine and she left him after a year of being married. This is after he spent thousands of dollars bringing her over.
And for your other questions, i dont know. but they are probably all different. So, take your chances.
And for your other questions, i dont know. but they are probably all different. So, take your chances.