Sharing the fixed length KANJISJIS server character set fields involves a different problem. The applications need to place enough padding within the field so that when it is converted to a different form-of-use, say KANJISJIS to KanjiEUC character set, the meaningful characters in the string are not truncated.
Truncation due to conversion and length change does not occur for KANJI1 server character set fields.
Because of the length change problem, you should use varying character fields when different representations can vary in length.