Kenmore has 6 basic models of bottom freezer refrigerators. They have from 3 to 5 variation on color, for 20 models altogether. The variation in the Bottom Freezer configuration is even less than it looks at first glance though. These models are all relatively similar. All are Energy Star qualified and have similar styling. Some of the models, such as the 7900* line and 6900* line only vary by one feature from each other.
In that particular case the 7900* models have an ice maker, and the 6900* line do not. Though they do have the option to install an ice maker. In all other regards they are the same refrigerators.