Essentially, yeah, a Lamb with the ears and tail shaved becomes sort of an "easy" version of the German. I say "easy", because in grooming competition, the German is fully hand scissored to make the body just a bit shorter than the legs. It's the same relative look, in other words, it's just the execution that's different, just as the Lamb is sort of the pet version of the Sporting clip that is allowed in special Veteran classes at dog shows (or at any UKC show). Your groomer will probably use blades/clipper combs unless she regularly does full hand scissored jobs. It will still look nice, either way.

This is a VERY plush German from a competition (not mine! I never remember where I steal pics from). Longer than most people leave it, but on this dog its very nice. The tail is also fairly plush, but scissored to a nice "carrot" shape.

This one is a bit less hair, a little more similar to how a pet version might come out. This one has a much shorter shaved tail.
When the ears are shaved, the topknot really looks more like a mohawk, so you may not even want to quite shave in a real narrow mohawk until you see what this looks like. Personally, I find the German is a very masculine clip while still poodley and elegant. I love it! Shaving in a narrow human-like mohawk, actually taking a blade into the skull part, they sort of lose the elegance and turn toward goofy. Which is also fine, if you're into that, but if you don't, it takes a while to grow back!
ETA: Ooops, I misread your OP that you didn't like the tail as that you didn't know what it looked like. Sorry! You can do the tail however you like! The main thing to remember is that poodles don't have rules!