Replying to Boots and bindings question

This might be a stupid question, but last year I had a pair of Nordica boots (not sure which model) and this year I upgraded a bit. The boots are very similar in size, but I'm not sure if they're exactly the same. When I step into my bindings (fitted for my old boots) the new ones seem to fit perfectly fine. I stepped in both of them and they were tight in the front and back. My question is, do I have to do anything to my bindings? They seem fine but I don't want to get onto the mountain and have to go change something. Thanks!