To compare two different Name-Values, you can create a seperate 'Verification' Name-Value.  This Verification NV will be of the Calc Name-Value Type.  It will read in the NVs that are to be compared.  

Once the two NV's are read in, their values are assigned to variables so that their results can be compared in a simple String Formula.  The String Formula asks the question if the two NVs are equal.  Depending on the result it will either return either 'True' or 'False'.  

The Verification NV can also be configured to have an 'Equal To' value.  This is where we will put the value as 'True', because both NV's must be equal before a Step Sign-Off is allowed.  

Optional Configuration

Optional configuration is available.  This 'Verification' NV may not be needed to be displayed to the end user.  So you can Opt to Hide NV from the User.

You can also display a customer Error Message to the User if the String Formula evaluate to 'False'.