You can find the size of each column of cells A and Target as follows:
idx=cell2mat(cellfun(@(x) size(x), A, 'UniformOutput', false));
idx2=cell2mat(cellfun(@(x) size(x), Target, 'UniformOutput', false));
Idx returns sizes of columns of cell A. (For Example idx(1:2) returns size of column1,idx(3:4) returns sizes of column2 and so on..)
idx2 returns sizes of columns of cell Target
You can compare sizes, also compare values(by changing you equation in cell function) based on your requirement.