private boolean isEquivalent(Data existingData, int existingDataTypeLength,
			DataType newDataType) {
		if (existingData.hasStringValue()) {
			if (newDataType instanceof ArrayDataType) {
				Array array = (Array) newDataType;
				DataType arrayDataType = array.getDataType();
				if (arrayDataType instanceof ArrayStringable) {
					if (array.getLength() == existingDataTypeLength) {
						return true;
					}
				}
			}
		}
		return false;
	}
Checks if PDB has been loaded in the program

@return whether PDB has been loaded or not
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb/PdbParser.java