The Acid Critical Table from the RM2 Companion is just as valid today as it was back then. ICE (both the old ICE and the current ICE) didn't change the damage conditions or the types of damage received, and while RMSS/FRP updated some critical tables, that did not invalidate or make useless the older tables.
You can use any critical table from any version of RM with any other version of RM without a single problem.