I can see the battery configuration in the 4x18a is 3v. The LED that it’s using requires either 6 or 12 volts. The only way to get to higher voltages to use a boost driver. Boost drivers tend to be more complicated so they cost more and they’re not as common. They’ve only really started to hit the scene in the last year or two. Also note that Max output for the 4x18a is 5 amp. That’s also very realistic for a boost driver to do.
The SBT90.2 is a 3 volt led. A decent FET driver should push it to over 20 amps.
You would probably need to talk to someone like Lexel about having a driver made to fit the 4x18a. He may have an existing design that can be modified to fit or else he may need to design a new one from scratch. He’s not going to do that unless you can sell enough to make it worth his while, though. Not completely from scratch, he already has the electronics worked out, its just a matter of getting a pcb with the correct size and shape.
A potential complication could be if the switch is soldered onto the driver. If the switch is separate and it’s connected to the driver with wires then it shouldn’t be any problem. Do you have a 4x18A or have seen the driver?