migrate from mac mini (Late 2014) to mac mini 2018
Cables needed?
Mac mini, 10.14
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How to move your content to a new Mac - Apple Support
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Connect the computers to each other
- If both computers are using macOS Sierra or later, just make sure that they're near each other and have Wi-Fi turned on. If either is using OS X El Capitan or earlier, connect them to the same network using Wi-Fi or Ethernet.
- Or connect them using target disk mode and the appropriate cable or adapter. Then start up your old computer in target disk mode.
- Or connect your new Mac to a Time Machine backup of your old Mac.
I would connect both Macs to your network using a wired ethernet connection. A wifi connection will work but a wired connection is faster. You can use Target Disk mode. as in one of the links above but you will have to purchase cables/adapters to use that method and I do not think that is cost effective unless you plan on using the adapters for another purpose.