I'm not familiar with the "KITE" but I did find it on the web
http://www.aerialtrainingservices.co.uk/ser_kite.htm
It appears to be a suitable trainer. You failed to give any info on the 4-stroke so it is hard to say much about it either. It may well be suitable if not worn out. Have the club/owner give you a lesson on the plane and then make a decision. I also have not looked up the other plane yet, will attempt to next.