kz model mix-up

I got a question for anyone with some answers. I have a 78 kz400b, well at least thats what I think. Everything on it matches isben's model id page. But when I registered it and insured it, it came up as a kz440-A. Any ideas and should I even worry about it?
thanks:S

as long as the vin on the frame and title match i wouldnt worry about it,parts on these bikes get swapped out over the years to suit whoevers riding it at the time.goodluck,happywrenching!