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2 meters = 120 leds. (3x 47 per module) + (2x 5) in between - 151 leds. So no, 2 meters won't be enough for the whole thing with 6 digits (XT). ;)
The sketch is using FastLED, so ws2811 would be supported. But it depends on what you want to achieve to notice any differences between ws2812b / ws2811. Most important thing is to watch strip dimensions (not thicker than ~1mm between leds, not wider than 10mm). APA102/SK6812 should work also but require to scale the parts along z to accomodate 12mm wide strips. If using 12v strips and feeding them directly like in the instructions make sure you're feeding the arduino using vin/raw, not +5V.