They didn’t come with any documentation or identifying marks, just a couple of CTs in a bag, ordered from the link posted above… I assume it’s the -019, but I can’t be 100% positive, so whatever ordering from that link sends out.
You didn’t say you ordered from our shop. If you did, then that instruction remains correct - you need scales = 3 for each CT ± any fine calibration tweak. Bear in mind the power is calculated in the front end, so tweaking the voltage calibration won’t correct the power at the same time - the two are independent by the time the numbers get into emonHub.
If one c.t. faces the wrong way, you should be able to put -3 – but I’ve never proved it. If it doesn’t, × -1 in the input processing does work.