The LT3744 is a fixed frequency synchronous step-down DC/DC controller designed to drive a LED load at up to 20A continuous or 40A pulsed. The peak current...
Datasheet LT3744 on Analog.com
I don't see any reasons why you can't. The LT3743 regulates the output current so the current going through 2 LEDs is the same. Make sure to set the maximum output voltage greater than the total forward voltage of 2 LEDs.