Baby Name Poll

twin vs. boys
We have two sons, Alexander and Nathaniel, 11 and 6 years old respectively, and we are expecting twin boys. We have been leaning strongly towards the names Victor and Gabriel, but we worry that they might not fit with our older sons' names, that are quite similar both in style and length. The other names on our shortlist were Ethan, Stefan, Leo, Leonard/o and Edward. What do you think of Victor and Gabriel with Alexander and Nathaniel? Do they look like two different pairings? Thank you for your help!