I had issues with it when I swapped to a wider rear end I don't think they are the same...
**Edit**
I am slightly confused...
Are you asking if the e-brake from the 85 will work on the 92 axle or if the back half of the 92 e-brake assembly (attached to the 92 axle) will bolt up to the 85 truck... I think the prior will not work where as the later one will...