The consulate should issue IR1 visa if your interview is after your 2nd wedding anniversary. No action required from you to switch the visa class. But whether you get a CR1 or IR1 visa, what matters is the date of your 1st US entry with the visa. Even if you somehow get a CR1 visa, if you first enter the US after your 2nd wedding anniversary, you are entitled to a 10-year green card. If you receive a 2-year GC by mistake, you may file I-90 for free, to get the card replaced with a 10-year GC.