Each lab provides different themed collections that may be applied to specific customizable products. First, some quick definitions:
Collections: Collections are a grouping of graphics with the same general design. PhotoDay will display to the customer all collections that are available for the product selected. Not all collections are available for all products. Within each collection, there are themes.
Themes: Themes are selected by the studio during job set-up. Themes can be based on a type of activity (football, cheer, dance, etc.) or color, depending on the lab. Scroll down to view the themed collections offered by each lab.
For each job, you'll have the option to choose theme variations in the Store Settings for that job.
Both of these labs offer the same collections for their customers.