They have the same meaning, except "till" is more informal. Hope that answered your question!

In this context there is NO difference. The word " Till " has other meaning as well such as " cash register " or "to work the soil "is also to" till." hope this helps

Till refers to the time/date up to a certain point. - e.g. the shop is open till 6 Until refers to up to the end-point or start of an activity. - e.g. You should not eat until you wash your hands I hope that makes sense!