@Override
		public int compare(Symbol s1, Symbol s2) {
			Address address2CompatibleWith1 =
				SimpleDiffUtility.getCompatibleAddress(program2, s2.getAddress(), program1);
			return s1.getAddress().compareTo(address2CompatibleWith1);
		}
Used to compare the symbols in two programs.
Comparator is intended to be invoked with primary symbols only and will compare together with 
all non-primary symbols.
Ghidra/Features/Base/src/main/java/ghidra/program/util/ProgramDiff.java