GT-I9300T - Is there any major differences?

Hi guys, I currently have a GT-I9300T model which is originally from Vodafone AU as it has their boot screen. I am currently stuck with 4.3 as it has no updates to firmware. I want to upgrade to at least 4.4.

What I am wondering is if there is any major differences between the GT-I9300 and the GT-I9300T in terms of custom firmware compatibility and rooting? I'm incredibly new to this sort of thing. Would mine be the international version?

Lastly, if it's actually possible to upgrade my particular model, is there any reputable 4.4 ports that would work and that you would reccomend? I want to use this as a learning tool incase I ever upgrade my phone and want more customization.

Thank you for reading.

Rooting and upgrading software questions - Samsung Galaxy S3 GT-I9300T

I hope this is the correct section to post this. I have a sgs3 GT-I9300T that is/was carrier locked through Vodafone. I say is/was because I can currently use an Optus simcard without problems. This specific model does not support any upgrade past 4.3 jellybean (which is bs lol)

So here I am, a complete phone noob, wondering how to root this specific model and upgrade to at least the 4.4.4 KitKat port ive seen posted. Is there any guides or how tos on the subject? Is there a difference between both GT-I9300 and the T variation in terms of rooting/flashing custom roms etc?

I have a dream to become Pokémon master but my phone is not allowing me to become one. Please help me