How to make a clean color mask of Z (depth) blending of layers?

I  mean if  I have two objects  having its depth info in 32 bit exr.    To put one against another and then get a mask for its color blending   that would render where pixels of top layer higher ( brighter in  its depth info) than corresponding  bottom one.
Something that would recreate Zbrush 2,5 D layers,     Blender Z combine node  or Fusuion merge node depth option  for depth blending .    Is there a trick to rightfully do so in Photoshop?   Maybe  a kind of blending modes combination ?
Preferably I would like to get an anti-aliased  mask as Blender does so  and not aliased Fusion's one.

Looks like  I am able to answer my own question. Here is how it works my way  :    Dropbox - sphere_cube zcombine.psd       You need to have layer selection "by layer" not by group to interactively move things
If somebody know how to do it more straight way or  how to combine more than two objects in a more simple manner  I would appreciate an input
ps. Now it needs a kind of quick  SSAO  sceen space ambient occlusion filter to be really useful.   Somebody know one for Photoshop?

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