I actually never thought about it this way and there has probably been no story telling it either.
There's just one thing you might not expect when you change the turn of events. If Lois propositions Superman before Clark can admit his feelings to her, then he won't do so after the fact either. That in turn may change exactly nothing for the original storyline because Lois may still be agreeing to Lex' proposal. The only questionable is her friendship with Clark and there are probably some stories out there where they remain friendly throughout her engagement.
That is my point of view on this change of events.
