It's a fair question. I don't know any friends who've tried a blind tasting.
To be fair, the heating element on the Trompo isn't just electric heating coils or something, there's real open flames (the pics I've taken might not've caught the flames properly at that moment).
But I don't think I let that color my impression. If something is delicious it's delicious (of course that's all subjective, LOL. ). Like, when Chef Avner at Cento Pasta told me the pasta they had that day were all dry, pre-packaged pasta (no fresh, handmade pasta), I was still blown away by their Bolognese Pasta (it was really delicious), even if they used mass-produced pasta.
On this latest trip, we had La Guera and Tacos Estilo D.F. back-to-back, within maybe 15 minutes of each other? So the taste was fresh in our minds. I asked each of my friends who went with us what they thought of the two Al Pastor places, and every one of them chose La Guera over Tacos Estilo D.F.
But yah, perhaps it might have the same flavors? Let me know if you try the taste test.