HRX217HYA

I just bought a brand new hrx217hya honda lawnmower from a local dealer. I noticed the model number on the mower is hrx2173hya. What is the difference between this and the hrx2174hya? Is it last year's model?

I pretty sure it was new since me and the owner put oil and gas in it. It looked dry before adding the fluids.

If it is last years model, should I be concerned? Should I ask for the newer one?

Thanks for your help.