Both these products are from Traeger’s. When it comes to the grilling area, the Traeger TFB42LZBC Wood Pellet Grill and Smoker Traeger Grills are 418 square inches larger than the 380 square inch grilling area from the TFB38TCA Wood Pellet Grill. But the Traeger grill TFB38TCA has a functional equipment caddy rack and preparation rack. Apart from this, there is also a difference in the price of these two. When it comes to features, both come with an elite digital controller, electronic auto-start ignition, 6-in-1 Versatility, easy to clean grill gates (porcelain), and 100% Pure hardwoods are fueled by pellets.