How to transfer data from MacBook Pro 2014(SSD) to MacBook Pro 2016
If your old SSD has been removed from the old MBP, then you're best bet is to purchase an external enclosure for you to place it in. 

Once you've done that you can connect it to your new MacBook Pro and access it like any external drive. At this point you can choose how you want to transfer the data. Probably the easiest will be to use the Migration Assistant app. For more information read Move your content to a new Mac.

In terms of the external enclosure you will need to purchase one that can connect to your new MBP, although you may already have various adapters or dongles etc that you can use to connect to USB drives, etc. However, since your old SSD is fine, I'd suggest you get an enclosure you can use all the time (one with the right connection for your scenario) as you'd then have a fast external SSD you can keep using.

You can purchase a suitable enclosure online or from most dedicated computer retailers.