English is not my first language so it is dificult to express myself.
I had oportunity to hold a real katana (mine friend bought it recently) and i was suprised how is diferent from the bokken i am used to.
I dont think that i could doit things with katana what i am doing with bokken (in kumitachi or awase...). It so hard to handle it .
Yes, it is very different. Learning to handle a sword properly would be excellent training for you and would greatly enhance your aikido.