Yes, they are identical
Probably not, just a plug adaptor. Most power units are multi-voltage
Yes, 1.0.064 is the latest, and probably last.
Unlikely to be a standalone box, but Echostar are building it into their receivers and I would expect that to continue.
The only slight caveat is that it supports both UK and US video standards so you might struggle to get the right setting initially. Plenty of help here though as many of us have done this.
Can I use it at a location such as work or a hotel and access multiple SlingBoxes from multiple locations?
There's a small caveat which wasn't explained. Not all places have free open access. Some places require you open a web browser to accept term of services for their wireless access. In these situations, network access is then granted to the MAC address of the device accepting these terms. Since SlingCatcher doesn't have its own web browser, you'll need to tether its connection. Depending on how elaborate network security is, a cheap router will help in these situations since it can act as a proxy. You can accept the terms on a laptop, the access will be granted to your router, and any device connected to the router will have access.