Personally, I do not like using "in kind" for fireproofing. I am not an expert in fire-resisting materials, but when you use the phrase "in kind" you have effectively said "the fire-resisting material which exists is sufficient to be matched by a new application." I don't often feel good about interjecting that opinion (when I am not sure what the material is), and would keep it more vague. I usually say something like "Restore all disturbed steel fire-resistive material per Building Code requirements; retain a qualified and competent Registered Design Professional to specify restoration when required by the Code."
Then again, if it is in your fee to perform the work, and you feel comfortable/familiar with the existing material, you may be able to specify restoration with IBC prescriptive language.
"It is imperative Cunth doesn't get his hands on those codes."