Thunderbolt4 is an Intel certification. It’s USB4 with all options enabled, Intel testing and licensing fees paid to Intel.
It’s very rare for AMD boards to have Thunderbolt, and this is not just Framework.
If you require Thunderbolt certification, get the Intel board - the 12th gen already has it and the 13th will. The AMD boards with USB4 and all options enabled will comply with Thunderbolt but won’t have the Thunderbolt certification.