So...you basically want to match object B with object A, both have the same vertex/faces count but modified shapes?
you could either replace the object B with the object A with Replace Objects (Modify>replace objects).....
or try making the object B as an instance of the object A.
Try this script I found on the internet (select object B, Shift+select object A, run the script):
/* jooMakeInstancesOfLastSelected.mel 0.1
Authors: Janne 'Joojaa' Ojala
Testing: if it works after a suitably long time without
much problems let me know. Report any problems.
License: Creative Commons, Attribution, Share Alike
Request by: fatih gurdal
About:
A simple script that will replace a bunch of objects with a
instance of the highlighted object.
Install Instructions:
place this text in a file named:
jooMakeInstancesOfLastSelected.mel
that resides in your personal Maya script directory.
Usage select all objects to be instanced then add the master object
to selection and execute:
jooMakeInstancesOfLastSelected();
Changelist:
10.09.2011 - Original file
*****************************************************************/
proc string[] justShapes(string $list[]){
return `listRelatives -shapes $list`;
}
global proc jooMakeInstancesOfLastSelected(){
$master = justShapes(`ls -sl -tl 1`);
$all = `ls -sl`;
$allShapes = justShapes($all);
if (size($master) != 1)
error "script does not account for transforms with multiple shapes";
for($i=0;$i<size($all);$i++){
$item = $all[$i];
$shape = $allShapes[$i];
if ($shape == $master[0])
continue; // skip its a instance
delete $shape;
parent -add -shape $master[0] $item;
}
select $all;
}
The caveat is that the objects need to have the translation X,Y,Z and orientation intact. If they've been frozen, you need to bake the objects' pivot (modifiy>bake pivot) to get the translation info, and then you can force the object B to be an instance of object A.
