The two devices are the same. However, a laser cutter is a laser that is optimized to cut material at a faster rate than an engraver. In addition to this, the cutting standard of the laser cutting machine is higher, but the engraving standard is lower.
Meanwhile, a laser engraver has lower laser power; so, it can't cut effectively through the same thickness level as a laser cutter. While it produces a higher engraving standard, its cut standard is quite low.
What makes these major differences is the machine's laser lens. Engravers have shorter focal lengths, resulting in fine spot sizes for high-quality engravings. At the same time, the laser cutter has a longer focal length and can withstand changes in the height of the object.
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