InRoads V8i Civil Geometry Schema - Compare/Differences between SS2 and SS4

I've developed a custom XML Report stylesheet using the Geometry schema defined in InRoads V8i SS4. 

Now my client is asking whether the same report stylesheet it can be used with InRoads SS2, but I do not have access to the schema definitions for SS2.

Are the differences between SS2 and SS4 Civil Geometry schemas documented anywhere that I can easily access? 

Alternatively, can I get access/download the SS2 schema files without having to install InRoads SS2?  That way I could compare the schema files myself.

Thank you in advance for any advice.