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Lahore1,
LC and I-140 are the same----not portable in either case except the priority date. I got my LC & I-140 approved last year. But I have to go through from the very beginning. I\'ll be very glad that some one could tell me that was not true. But I never expect that.
The only advantage you can take is that you may have an earlier priority date in case the processing times in INS becomes not current again in future. Otherwise, it is useless, I think.
My advice is Be patient and go step by step.