I am new to quantum computing and have been trying to understand the Quantum Fourier Transform (QFT). Through my research using both the Qiskit textbook and other sources, I see differences in how the circuit is actually implemented. My question is: Why are the two circuits below equivalent? Does the order of the wires in each circuit matter? To me they look significantly different as even the operations are being done on different qubits.
From the Qiskit Textbook:
From other sources: