The difference is that a tulpa feels separate from you, in that you have no control over their actions, so a tulpa is not seen as being connected back to one's own identity or consciousness
[Identity has a dual meaning here. That of an alternate state of 1 associated being and that of a separate(tulpa). Of course you can also argue that the tulpa type is just an extension/more advanced/separate form of the first. But it's still somewhat different concepts that you are using 1 word for.]
[So I am doing philosophy? Well that aside I disagree with the meaning you use so I won't use it that way. I prefer "being" or "entity" for what you are using.]
I like to have understanding where people don't agree, I think. I don't think it's important to convert the meaning other people use, just knowing is enough.
I see awareness and consciousness as something the brain automatically generates in response to outside sensory input. A tulpa is created via someone giving sensory input in the form of talking and attention towards some sort of "point", which is usually the idea/impression that the host creates of someone other than themselves being in their brain. This sensory input being directed at this "point" over time creates a second awareness/consciousness. This is almost exactly how any person's consciousness is formed, the difference being with hosts or originals that the consciousness is generated naturally through the senses taking in input from the outside world.
The idea of separate consciousnesses makes intuitive sense to me. If you get caught up in what consciousness means, exactly, beyond being "the thing that allows for observation and awareness" you won't take anything away from what I say