How do you tell the difference? The holograms are the same but different colors. Series one is Silver and series two is Gold. Right? Any other differences between the sets?

The numbering was different too. Between series 1, series 2 and gold series the same 4 holograms were used on the front and the numbering was different on the backs.

The same images were also inserted in Topps Jurassic Park comic books.

But how you tell the difference? Aren't series 2 holos Gold? No one seems to be able to tell the difference.
I need # 2 of 4 Gold spitter.

So the Gold cards were in the comics?

Now, I'm confused. Is there a difference between gold and Amberchrome?

According to Allender, the silver holograms were only in the packs of Series 1, 2, and Gold. The Amberchrome (gold-colored as opposed to the "Jurassic Park Gold" set) were only in the comic books.