Thats not cool to say about scott, man.
Yes, ground each sensor directly to the circuit.
I'll have to read deeper into it at work and compare the sensors.
it sounds like 49 (s14) matches with the 37 (s13); and the 27 (s14) goes with 20 (s13). Check what the voltages should be at each wire, that will tell us which wire does what, and which wire we can toss out.

S13's have a CAS (cam angle sensor), instead of a crank pos sensor.

I forgot if you asked anything else.
PS: use solder only, because butt connectors can throw off the signal enough in these sensative sensors to really mess shit up.