While the TBT4-240W-1M and USB4-240W-1M are essentially identical in terms of specifications, the TBT4-240W-1M has passed Intel's notoriously rigorous Thunderbolt Certification, which makes it officially Thunderbolt Certified. The USB4-240W-1M is USB-IF Certified, which is another set of high standards to ensure functionality and interoperability. While it is not officially Thunderbolt Certified, it is still fully compatible with Thunderbolt devices. The TBT4-240W-1M is also USB-IF Certified.In either case, you can be confident that our cables will be compatible with your Thunderbolt and USB4 devices!