I bought it here and it appears to be the same as Steam as it has the updated features that are not in the humble monthly version. The Itch page here also states it was updated a couple days ago.
Recent community posts
I have been checking in on the game since a bit before Alpha 2, and the Career mode seems to be exactly what I was looking for! So far I am enjoying the progression of unlocking the different resources, logistics, etc via the tech tree (and I'm always a sucker for tech trees generally!). I like having a focus by being forced to use certain industries and to think strategically about how to unlock certain products. For instance, in my current playthrough I am currently working towards getting cheese in production and then unlocking further factories. I am also thrilled that I am now able to generate a profit! (I sucked at that in earlier versions haha!)
Anyway, I just wanted to let you know that I have been enjoying watching your game develop and flourish. This game is definitely up my alley (big fan of Anno, Transport Fever, Industry Giant 2 , Factorio, and basically anything with production chains), and I am excited to see where it goes. I also wanted to let you know that I really like the graphics style, and I very much appreciate that my ultrawide monitor (2560x1080) is supported.
Keep up the excellent work, and best of luck with the Steam launch! I will certainly leave a positive review when you launch!