Looking through the specs on these 3 M1 Macs, I noticed that they all have USB4/TB3 ports, but the specs say "• Thunderbolt 3 (up to 40Gb/s) • USB 3.1 Gen 2 (up to 10Gb/s)". So it's not USB4 (which is up to 40Gb/s)? Are TB3 and USB4 the same thing now? *confused*