You either need someone with mldonkey to bridge the gap, or better yet, I think you can try ftpdonkey or try:
a) download both
b) get 35kb or whatever is needed to reserve the file as a part file in both cases.
c) note down the good file, and the bad file .part files. You can find this by middle clicking on the files in question within emule
d) close down emule
e) replace the 'good' completable file with the bad file (delete the original and rename the bad one). Delete the part.met file for the bad file
f) reload emule
It should then dump corrupted parts. Replace delete with "move to another directory" is an intelligent move
