What if I want to use a shorter ( 5 feet ) cable from amp to pedal board and then guitar cable to guitar?
What would be the difference in sound if I use patch cable material from amp to pedal board, as opposed to guitar cable - pedal board - guitar cable?
Let's say an SIS evidence from amp to pedal board.
Technically, when you are using a shorter cable, you are lessening the total capacitance of your cable. Therefore, more high frequencies should come through.
SIS Evidence is actually the solderless plug, not the cable itself. To use the SIS Evidence plug, you have to use a particular cable with a solid core, much like the Evidence Monorail or probably the Lava mini SOAR.
Although the SIS Evidence plug + Monorail is a very effective and sturdy patch cable combo, I would still be hesitant to use it for "guitar-board" or "board-amp" applications. Such application would require an even more sturdy cable-to-plug connection that can withstand the rigors of continuous movement and the possibility of being stepped on and coiled around, etc..
The only advantage I see with using the SIS Evidence + Monorail combo for guitar-board or board-amp use is that it's very lightweight and feels like nothing. Then again, there are other similar cables which may be equally lightweight but are designed specifically for guitar-board or board-amp use, such as some George Ls.
As for the difference in sound, I'm not too particular on the differences... but I do rely on the cable's specs heavily when choosing what cable to get (type of plugs, capacitance per foot, length, material of composition, price).