My work uses Redshift, which apparently has a different smoothing algorithm to Maya's default OpenSubdive Catmull-Clark. In Maya's default smoothing, border and corner vertices are not pulled. In Redshift smoothing, all verts are pulled to the next vert, whether or not it is a border vertex. This requires support loops to…
set the "vertex boundary" to "sharp edges" in the opensubdiv controls on the mesh to get the "square becomes circle" effect. There's a bunch of controls under the shape node in "smooth mesh" that you might want to adjust.
You could use the attribute spreadsheet to do this but the easiest way is to create a script that does this. I was feeling generous so I wrote a quick script for you and put it here: https://www.artstation.com/dankeating/blog/dKOZ/quick-script-for-changing-smoothing-values-across-multiple-objects