Both of the other contributors have offered good suggestions especially since we do not know how these other drives are configured in this system.
If the drives are independent data drives, then you could remove them and use a USB to SATA Adapter (one supporting an external power source if they are 3.5" drives), SATA drive dock, or an external enclosure to connect the drives individually (some docks or enclosures may allow two drives at once) to the new Mac. Just make sure the device used actually supports a 4TB drive since some older devices only support up to a 2TB drive. Also make sure the device is also compatible with an Apple Silicon Mac...again not all external devices are compatible with an Apple Silicon Mac (usually for older devices).