Good information. Thank you.
There are significant differences between the 680 series actions and the DT10 including different locking systems and the DT 10's removable trigger. The DT10 is not part of the 680 series but is based on the discontinued ASE90.
Among the currently-produced 680 series (682, 686 and 687) the actions are same, internal parts interchange among them and the main differences are cosmetic and on some a trigger that is adjustable for length and automatic safety.
Here are two links from Midwest Gun Works, a Beretta authorized factory service centre, which shows that most internal action parts are common among the series. What parts are model specific are usually on the outside and the differences are cosmetic.
http://www.midwestgunworks.com/page/mgwi/ctgy/beretta-680-series-parts
The spares kit for the 680 guns covers all of them.
http://www.midwestgunworks.com/page/mgwi/prod/beretta-680-series-parts/EK68612
Beretta may argue the higher grades are somewhat better fitted and finished internally but the basic action is the same whether it's a White Wing or a EELL.


















































