But how is that any different than the original guy? Even if he's the same person from when the mask is taken off, he doesn't look very similar, at least not initially before that time passes. Plus you'd expect Anakin's force ghost to look like Anakin in his prime, not 40 something year old Anakin that looks like he never needed a suit and couldn't possibly of actually existed, but I'm not too sure how force ghosts work
Honestly I don't think either are recognizable immediately visually, but the viewer would use logical reasoning, I mean who else could it be? So changing it to prequel Anakin just adds some consistency. There's a lot of changes in the OT which are very bad, but this one always came off as fans trying to be upset.