Arguably, the 45 W features a more versatile port selection, with the 67 W containing an integrated USB Type-C cable followed by a pair of USB Type-A ports. By contrast, the new 45 W variant complements its integrated cable with USB Type-A and USB Type-C ports, with its peak output shared equally when all ports are in use simultaneously.
Xiaomi has not revealed pricing or a specific release date yet. With that said, the accessory's addition to its global website indicates that it should eventually be sold in all markets in which Xiaomi officially operates. Please see Xiaomi's website for more details about the Power Bank 20000 45W Boost (Integrated Cable).