=SUMPRODUCT((Tracker!$K$5:$K$241=Plan!$C5)*(Tracker!$D$5:$D$241=Plan!$N$4)*(DateRange>B2)*(DateRange<B3))
to include the dates in the range
=SUMPRODUCT((Tracker!$K$5:$K$241=Plan!$C5)*(Tracker!$D$5:$D$241=Plan!$N$4)*(DateRange>=B2)*(DateRange<=B3))