conditional constructions - What is the difference between 'should' and 'if'?

1. Should you be lucky to invite the Seoul,


2. If you are lucky to invite the Seoul,

What is the difference between the two sentences in meaning? And what is the reason we change the order from 'you should' into 'should you'?

Answer

Allow me to amend your phrases and then explain the difference (assuming this is addressing someone who may be invited to Seoul):

1. Should you be lucky enough to be invited to Seoul,


2. If you are lucky enough to be invited to Seoul,

They both mean the same thing, as they both show that this person may or may not be invited to Seoul. There is very little difference.

Saying 'you should' would suggest that this person should expect to be invited to Seoul, and 'should you' would imply that they may, or may not be invited.