https://www.youtube.com/watch?v=qvdVBzuGWr4
You can easily understand where the difference is because the data is different between the eyes. The difference appears 'ghostly'. In a similar way, data from the mind's eye is different from data from the physical eyes when those two 'streams of data' are blended.
Anyways, this is nothing like what I experience when I imagine something.
your imagination is more like it's in the the back of the head, yeah?
What helped me 'move' where my imagination was (to the front and center), was to do the flame meditation. Which is to focus on a flame in a dark room for a few seconds, close your eyes, and try to retain the phosphene afterglow in the flame shape. and repeating that until you are able to retain image of the flame while your eyes are closed.
Similarly: 'drawing from memory' - particularly from recent short term memory - was another method that had a profound impact on my ability to visualize.
Both of these take time and commitment, but they have worked for me. They may work for you.
It's similar to replaying music in your head (if you can do that), you can hear the tune but your ears "know" no music is actually playing.