They also look similar to Panzer III (StuG III) links because it's hard to estimate the size of the links by just looking at your photo.
Actually the more I look at your picture I'm more inclined to say Panzer III rather than Panzer I.
You could assemble a handful of them on a piece of masking tape and check to see if it fits the cogs on the drive sprocket to the Maultier? That's probably the easiest way to find out if they work or not.
I've got a whole box full of sprues with just track links and I wish I'd marked them with the kit they came from instead of just putting them all in the same box...
Luckily I mostly just do German tanks and there aren't too many track types apart from a few, but they are really obvious.