Thank you everyone for your suggestions. Well, I set up both OS's with only those Thinkvantage options I need. I am stunned as to how much faster it appears to be. Where does this speed come from? The 166MHz gained by the T2600 over the T2500, combined with 7,200rpm over 5,400rpm?
Anyway, I hooked up both units to the router by way of Ethernet, only to find out that I have to plug them into the wall, as the process "will take a long time".

Couldn't do it, as I needed it to work on.
Next, I tried the Ethernet cable and simply connected them. Nothing happened. Neither NIC detected the cable. How would I set this up with changing the IP address??
So if I can't get this Ethernet to work before I go to bed tonight, I'll take them both downstairs to the router with their respective AC adapters, and use Easy Transfer.
I did watch it copy one 500MB one time. My God, that took forever. I need 100 times that transferred. 50GB. Again, no settings, OS's, profiles, etc. Files ONLY. Maybe I should just burn DVD's? How long would 50GB take using the router with WIRED Ethernet, not WiFi?
Thanks again guys!

15-inch Core 2 Duo ThinkPad T60p | Ivy-Bridge (Late-2012) Mac mini w/ quad Core i7-3615QM 2.3GHz, 16GB DDR3-1600MHz RAM, 240GB+180GB Intel 520 Series SATA III SSD's, 5x3TB Drobo 5D