Kennedy Experts??

throughout the production of Kennedy's, has there ever been a difference in the size of Kennedy and lettering on the obverse -looking through some coins tonight and noticed an obvious difference in the image of Kennedy and lettering on a 1982D (large) vs 1998D (small) - thanking you in advance.
currently putting together a EF/AU/BU 18th & 19th Century Type Set; and CC Morgan Set
just completed 3d tour to Iraq and retired after 28+ years in the US Army
just completed 3d tour to Iraq and retired after 28+ years in the US Army
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In 1996, the portrait was reduced in size which gives it the appearance of a small headed Kennedy.
The name is LEE!