According to the BIE article by Charity Allen, PBL Design Deep Dive - "What Products, and How Many?" there are several types of student products:

The same product with the same focus or topic
The same product with a different focus or topic
*A different product with the same focus or topic
A different product with a different focus or topic

We're discussing the possibility that a different product with the same focus or topic will be appropriate for our Summer PBL project. This will allow students to show what they know in a variety of ways.