It's a funny and interesting comparison, but you have to ask yourself... would the milk truck segment make any sense without the beer truck segment coming first?
Yeah, kind of. It would still have been funny, but instead of an, "Holy shit! He's doing Austin's beer truck shtick with a milk truck!" vibe, it would have been more of a "What the fuck is he doing?" vibe. The audience would have had nothing to go on, it would have been new and interesting, but it would have been more weird than anything else.
That's why Austin's beer truck was the better one, it was the original and it made Milkamania possible. Stone Cold Steve Austin and beer were almost synonymous, and when he came out there with a whole truck full of beer and sprayed it all over the Corporation, it just clicked, and everyone loved it.
The reason the Kurt Angle milk truck made sense was because Austin paved the way for him, and that's why the beer truck is superior to the milk truck.