The only difference between an LED-compatable relay and the stock relay is the lack of a burn-out sensor on the flasher circuit. The burn-out sensor looks for a drop in current caused by a burnt-out bulb and flashes the blinkers more quickly to alert the driver to the burn-out. The LEDs use less current and trips that circuit.
I'm running an LED compatible relay with a mix of LEDs and incandescents and it works fine.
For what it's worth, the CF13GL-02 didn't work in my 1994 truck. Whenever I engaged the turn signal, both sides would blink, as if I had the hazards on.
I ended up buying an LED-compatible relay from Auto Zone that works. That said, the relay I bought refused to blink when I was running LEDs front and rear. I had to revert to incandescents in the rear to get enough current draw to trip the relay.