Inter are in a very great situation now. They are not just dominating the league. In the recent times, their closest opponents to them in the standings had really difficult games too while Inter were having much easier ones. And this was another factor that helped Inter open the gap with them more.
Inter Milan players have more experience than AC Milan players in Scudetto competition and it can help them to win it in this season. However, if the Scudetto race is only between AC Milan and Inter Milan that I doubt it won't be like that, AC Milan won't let Inter Milan to win this race too easily. It is like a bigger Milan derby, a derby for Scudetto.
I would guess that there will be a bit of difference for sure. I mean imagine it this way, if Inter keeps winning more and more, and Milan still has a bit of rare loss and tie here and there, the gap will be a lot bigger. I mean look at how well Inter has been going lately, and yes Milan is not bad neither but they look like a typical team that ends at the second position.
The difference is that both teams dominate the league easily, but one ends up losing unexpectedly. Same happened to Liverpool before as well, City dominated the league easily, Liverpool did as well and they beat everyone by a large margin but ended up with unexpected losses or ties here and there. I am not saying Milan is a bad team, they have the ability to beat any team in the league including Inter, but then they end up losing to a midtable team out of nowhere and cause themselves trouble.