Iguanas can be different colors for different reasons....
Where they come from can be a reason for some iguanas being brown/orange, and other areas iguanas a more green, and some areas iguanas have a more reticulated pattern.
Also during this part of the year most iguanas are in breeding season and during this season their colors become more orange to signal they are in breeding mode. Normally males turn orange and some more than others. But even some females do. My female turns quite orange during breeding season.