"Does it look like the Kender engine?"
Not really at all.
It looks like the Kender engine there uses an electrically driven compressor. Mine uses a Stirling type heat driven displacer chamber as the compressor. The Kender engine uses a closed gas-cycle with compressed helium as a refrigerant. Mine uses an open air-cycle using plain old air as a refrigerant. The Kender engine prototype looks wildly complicated. My engine is relatively simple by comparison.
The key elements and the theory however appear to be the same. i.e. compress a gas (Helium or Air) remove the heat via a turbine (I use some of the heat in the compression phase to run the "compressor" since my compressor runs on a temperature differential, more like a Stirling Engine. Kender uses an electrical compressor) And use the cold produced to get your temperature differential between the extreme cold from the turbine and ambient air temperature.
All in all, my engine is simple enough that any model builder should be able to make a working prototype. (If the concept works that is)
The Kender engine has been in development for years, though, they are shooting for much higher energy outputs by using a compressed gas and extremely low temperatures which presents a lot of problems - like material issues.
So, in short, no, there is no visible resemblance but there is a similarity in principle. (i.e using a turbine to create a heat sink so as to extract energy from ambient air temperatures - like a Stirling Engine running on ice with the Stirling engine being used to run an "ice maker" that is used to keep the Stirling engine running on ice...
Sounds like, but isn't "perpetual motion". It uses indirect solar energy trapped in the atmosphere.
I tried uploading a drawing I made of my engine but it wouldn't upload for some reason, but you can view it here: