318 is developed using US customary units. The metric version is strictly a numerical adaptation, which is where problems like a 25.4 mm tolerance (three significant digits) derived from the original 1 inch value (one significant digit), resulting in conveying a entirely different intent. They have been trying to capture the intent better in the recent adaptations.
The biggest issue will be conversion to the local formwork measures, concrete characteristics, and rebar sizes, grades, and characteristics. For instance, in some places, rebar grades (yield strengths) are middle of the normal distribution rather than the minimum yields used in the US.