Most basic functions of TH-682 and TH-682pro like Group Call, P2P Call, Quick Call, Emergency Call are same. Both of these two items has GPS and can receive Dispatcher Message. Here shows you more about the difference between these two.

First Functions

TH-682pro allows you to connect to Wi-Fi, and has Indoor Position available while TH-682 works with Bluetooth Handy Microphone TH-P1 and Bluetooth Earpieces TA-B1. At the same time TH-682  is capatable of NFC.

Here is video links for your reference

WIFI:

https://www.iptwowayradio.com/408-th-682pro_connect_to_wifi_via_dispatcher_message.html

Indoor Positioning:

https://www.iptwowayradio.com/522-bluetooth_beacon_setup_for_th-682_pro_two-way_radio_indoor_positioning.html

Bluetooth:

https://www.iptwowayradio.com/442-connect_finger_ptt_with_th-682.html

NFC:

https://www.iptwowayradio.com/441-nfc_patrol_on_th-682_poc_radio.html

Second Frequency

Version of TH-682pro for Americans includes B13 B14 B66 B71 when TH-682 adds B17

Version of TH-682pro for Europeans increased B28 B38 B40 B41

Hope all these can help you distinguish these two items

Product Links

TH-682pro:https://www.iptwowayradio.com/16-IP_Walkie_Talkie_TH-682pro_With_Indoor_Position.html

TH-682:https://www.iptwowayradio.com/17-IP_Radio_TH-682_Featuring_Bluetooth.html