The "Junkers" is a modified Bowers Fly Baby and I think the "SE5a" is a 3/4 scale replica based on a modified Currie Wot. How they handle in comparison to the real things I have no idea and as there are no flying Junkers CL1's any more I don't think there is anybody alive who does know. According to the replica's owners the Red Airforce operated captured examples until the early 1930's as they were very good aeroplanes. I'm reasonably sure that the Fly Baby is non-aerobatic whereas the Wot is at least semi-aerobatic so it's no surprise that the Se5a won the dogfighting!
An entertaining program but the only flying that accurately reflected reality was the photography from the genuine Bristol F2b from Shuttleworth.