We got our Gecko, Goo, second hand from a friend who had to move unexpectedly and were told he's a Marbled Gecko. However after doing some research on them, I'm starting to have some doubts and have become very confused.
I took this first photo to show how big he is and a few others to show his features.
The reason I'm confused is because when I first got him and started reading up on Marbled Geckos, I was reading about a species called Christinus Marmoratus, which is what I assumed Goo was. When I decided to look more into photos of this species, I realized that Goo doesn't really look a lot like them.
Then I started looking at other Gecko photos to see if I could identify him visually and I came across a species he looks much more similar to called Gecko Grossmanni from Vietnam. I looked at a few pictures and they look much more like Goo than C. Marmoratus in my opinion (for example, his toes don't match up with theirs) so I decided to read up on G. Grossmanni.
Here are some pictures pulled off of Google that are (supposedly) G. Grossmanni. These all look
a lot like him to me, then again I am new to Geckos so I could very well be completely wrong! Haha
Now I am even more baffled as I keep finding all of this conflicting information on these two species from different sources, a few saying that they're very different species but others claim they're the same.

I know both species are commonly referred to as
Marbled Geckos due to their appearance, but are they really just "the same" as people claim?
I am so confused.

I just want to do whatever is right for him!
Any input would be appreciated!
Sabrina