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we have a CPSR railing (24" concrete parapet with a steel railing upper.  the bottom width was increased by 1" on the traffic side for aesthetics (max reveal =1/2"). The railing detail was supposed to include a 1" spacer so that the plane of the railing and the plane of the aesthetic treatment would be be the same plane.  The contractor left out the spacer, is there a likely to be a different crash response?

the railing is mounted on a sidewalk.

As I read your question, it would appear that the tube rails would now be offset 1/2" behind the face of the concrete parapet. We believe this would have limited affect on the safety performance of the railing. 

One item to note in looking at your detail is related to the terminal wall and how the end of the railing is configured. We recently worked with MnDOT to develop tapers for a similar end wall that may be useful to reduce snag in those areas. See the report at the link below. 

https://mwrsf.unl.edu/researchhub/files/Report431/TRP-03-403-21.pdf