2015 IECC residential prototype models?

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Hello,

I am wondering if anyone has links to residential (single family and/or small residential 'triple-decker') prototype models, analogous to the US DOE 90.1 prototype models? I am looking for prototype models that are minimally code compliant in Massachusetts.

I found the following link to some IECC residential models, but it seems that the most recent edition is 2012 IECC models. https://www.energycodes.gov/developme...

Are there any 2015 IECC models, or a resource that shows the main difference between the 2012 and 2015 IECC?

Thanks so much! Ryan