problem statement

i am working with a pricelist
i have 4 columns. column A=category, column B=item code, column C=price, column D=year.
i want column E to contain a formula that will appear the value false if the price between year 2003 and year 2004 has changed, and the value true if it has not changed (formula ignores 2002 price).
p.s. item code is not unique for each year as it may appear several times in a year if it belongs to multiple categories

how could create this formula

pls help me!!!