No, I cannot take the job until I will have the card in my hands! Now, all I have is a letter from local office to appear concerning this case, it does even no tell EAD case is approved, so I cannot use this instead of the card.
Q1 No, no LUD changes, only once when my case was transferred to local office. After that it was in local office and in this case no LUD change happens, as for my I-485 also.
Q2 Yes I must go back to local office and they will issue me the EAD card same day, probably dated back to the approval date (I do not know this date, maybe Nov 11 which is the date on the invitation). But only on Nov 22! I will come, they take my picture, and after one hour they will give me the card. Bad thing is, I thought I will get the card after 90 days and I got the ticket in advance, and I will loose it now because of this card issue....