I've mentioned Australian Tim Tam cookies before, and how you have to special-order them because it's hard to get them in the US.
Well, one of the things Tom got me for Christmas was a couple boxes of these:

That's right -- looks like Pepperidge Farm has cut a deal with Arnott's to sell them here!
However, a comparison of the ingredient lists on the Pepperidge Farm and Arnott's packages made it clear that they weren't quite the same.
So, I did a comparison of my own.
Both looked about the same from the outside.

As well as on the inside.

But the actual taste comparison? Well ... The overall texture is about right, though the Pepperidge Farm version might be a bit crisper. But the difference that jumps out at me is the outside coating of chocolate. Now, there is some variability between packages even of the Arnott's brand, but still ... the thickness and flavor of the outer chocolate shell ... I mean, it didn't taste bad by any means ... but it wasn't the same. The Pepperidge Farm cookies are good, definitely -- they're just not quite "the real thing".
Both cookies do provide very good slams, however.
Conclusion: If you've never had the Australian Tim Tams, the Pepperidge Farm Tim Tams are worth a try, just to see what we're all talking about. If you're already an Arnott's purist, however ... well, you've been warned.