are all power/ground wires one and the same?

2011 Nismo#91

Wire is not wire. Especially when it comes to "audio wire" many of which are aluminium or copper coated aluminium. For example if you wanted to run up to 70A through copper wire you would want AWG #4 wire size, while if it was aluminium you'd want to run #2 which is a larger diameter. Audio wire meets very few standards for most of them out there and price has no really guarantee on performance.

Go with tested and good end user reviewed cables.