All the original Phantoms were sold with standardized, clock-wise (CW) tightening threads, even though two of the four motors spun in a CCW direction. It was not that big a deal, 2 motors were automatically "nut-self-tightening" and the other two had the potential to, if you did NOT tighten the nut sufficiently, and check it periodically, loosen and there was the possibility of a prop coming off in flight.
I have that original model PH and it is NOT that big a deal. Never had one loosen. The ADvantage is that there are a LOT more prop options available, including triblades AND balancing those props is a LOT easier.
The downside of the CW-only set up, in addition to the "loosening" problem, is that the CW/CCW setup makes it much more difficult to mount a prop on the wrong direction motor (mount one of a set of four wrong and I guarantee you there is another one on wrong). THAT was a mistake almost everyone made sooner or later with CW-only. You found out when your take-off flipped without loosing contact with the ground. Two motors pushing UP and two DOWN. Ask me how I know. Another ADvatage of the CW/CCW system is that one can mount/dismount the props a LOT more quickly with less careful double checking to get it right.
The least of the ADvantages of the CW/CCW sets was that one had few options other than to buy the DJI Props-integrated nuts. Good for DJI....maybe not so good for you. And balancing is much more difficult.
If your motors are all CW....and you got them for a good price....and they are a motor you want.....and you are otherwise OK with maybe getting a different set of props....then I would NOT bugger the whole deal just on that issue.
If your original PH had 2 CCW motors and you are replacing 2 of them with CW motors there MIGHT be a need to reverse the wiring to make the motor spin in the CW direction. I don't know but that would not surprise me.
