Changes needed when upgrading from 2.4.6 to 3.2

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We have been shipping OpenCV 2.4.6 prebuilt dlls for several years in our commercial product. We are preparing a new release and want to upgrade to using the prebuilt libraries for OpenCV 3.2. We use VS 2015

1. Is there a list of changes we must make to our code to use the new version of OpenCV? Or is it simply a matter of dropping in the new dlls and rebuilding?

2. I downloaded opencv-3.2.0-vc14.exe and extracted the file. I found the "world" dll under \x64\vc14. Since we are building 32 bit apps does that mean I cannot use the prebuilt libraries. Are 32 bit versions available somewhere else? Or will we have to start building our own dlls form the OpenCV source.

Thanks