Yeah, pretty much the same here. I can imagine shapes, smells, textures, whatever, but it's entirely different from seeing, smelling, or touching. Concepts, not images. Feels like the same part of the brain I'd use to, for instance, write a computer program. No issues visualising and designing 3D models either, or imagining what something in a book looks like.

Same when dreaming; I could describe everything in my dreams (if I had time during the few seconds after waking up when I still remember them) as if I had seen, heard, and felt it... but it was a completely different experience from actually seeing, hearing, or feeling it. Which means I can never mistake a dream for reality (which I suppose means I lucid dream too), because it's immediately obviously different (and I'm on the bed, with my eyes closed).