Correct Lothar was taller than Manfred which is why in the TMP piece we do say the set is inspired by the famous duo. We wanted the pilots to be of generic use and I felt if we made Lothar really tall that won't be of help when mixing with other figures.
If you want to make lothar taller its easy to do, snip off the legs, add some putty and repin. One of my many personal projects
Hope that helps
Thanks for posting this Helen. Next up Italians and Late War French