Hey Dan,
The B747 electrical system was designed by Westinghouse for the B707 in the 1950s. It had a few tweaks but for us ex B707 crews it was obviously a descendant of the B707.
The VC10 & VC15 had their own quirky electrics, replete with a mass of fuses. I didn't see too much similarity but I was only licensed as "Limited Class 2" for line maintenance on the Hush Puppy.