The IR-1 and CR-1 are the same visa, an Immigrant Visa. It is the length of time married at entry to the US that determines your immigration status. If you have been married less than two years you will have conditions on your Permanent Resident Status and will be granted a two year green card. You must then apply to have this condition removed within 90 days of the two year anniversary of your entry to the US. If you have been married two years or more on entry you will be granted Permanent Resident status with a 10 year green card.
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