Custom plugin fails compile in ps sdk 2020. PSSDK**** Function does not take 3 arguments

Attempting to build custom plugin on Windows 10 originally created using PS SDK CS6 and VS2010.

The plugin was successfully built in VS2012 & CS6.

I downloaded the "adobe photoshop sdk 2018" and successfully built custom plugin in VS2017 (v141) & Windows SDK 10.0.18362.0  on Windows10.

Next, I downloaded the "adobe photoshop sdk 2020" and get the several compile errors on the following PS SDK functions:  

CS2660 'PSSDKRead':function does not take 3 arguments.

CS2660 'PSSDKWrite':function does not take 3 arguments.

CS2660 'PSSDKSetFPos':function does not take 3 arguments.

I read another user's related issue, but their issue has not been answered.

https://community.adobe.com/t5/photoshop-ecosystem-discussions/file-format-plugin-issue-pssdksetfpos-always-returning-error-code-20-write-error/m-p/10986528#M315214

Question: Is there any documentation that describes the changes between 2018 SDK and 2020 SDK related to this issue?

Thank You.