They actually serve the exact same function. Some manufacturers refer to them as Elevating Docks and others refer to them as Dock Lifts.
It is the same with the common terminology, hinged lips and hinged bridge plates as well as with safety trip bars and toe sensors, to name a couple of examples. Different words, same function.
In 2012, ANSI MH29.1, the glossary of term, was revised in an attempt to standardize many of the terms used primarily for the customers benefit. Some of these terms can be confusing to the customer, especially with different manufacturers using different terminology to explain the same function/feature. Refer to ANSI MH29.1 Safety Requirements for Industrial Scissor Lifts for the glossary of terms describing the common terminology.
Contact a Pentalift Sales Representative for more information.