Somebody asked me today if it was OK to mix the old and new types of symbols which denote if a substance is hazardous to health. He was concerned with the containers having new symbols whilst the MSDS had old ones.
There is a long transition period from 2009 to 2015 for the new "red rhomboid" symbols to take over. In my opinion, because there is no confusion between the symbols (with the possible exception of that shown above where ! means caution), there is low risk in mixing these and therefore it is acceptable to have different styles in use, but not on the same document or label.