The coins were dated 1992, but were probably minted during different years and little differences in design occurred often. Sometimes the varieties are classed as "patterns" since not many are known and there is enough difference in leaves etc to suggest maybe a different design was tried out for striking coins - I found a 1994 dated coin that maybe a pattern in change from grocery store a few years ago.
All of the coins that are dated up to 1996 were not released into circulation until Hryvnia currency was introduced that year. There are more varieties particularly of the 1992 and 1994 dated coins than any other years.