Based on this product's specifications, here are some alternatives and similar models
Extruder Assembly Right for Flashforge Creator 4 (HT) 0.4 mm nozzle
Summary description:
Replacement right extruder assembly for Flashforge Creator 4, High-Temperature (HT) version with a 0.4 mm nozzle. Designed for compatibility with Flashforge Creator 4 3D printers, this extruder unit is intended for filament feeding and hot-end extrusion tasks. Supplied as a single-piece pack for repairs or upgrades of the right-side extrusion system.