it doesn't matter 是多用在回答别人向你道歉的时候,比如,Tom:I'm so sorry for that.Lily:It doesn't matter/It's OK.
Thank you all the same 多用在你向别人求助或者询问但别人无法帮到你时你所表达的感谢.
ex:
Tom:Excuse me ,could you tell me how can I get to this place (请问这个地方怎么去?)
Lily:I'm sorry ,I'm a stranger too.(对不起,我对这里也很陌生.)
Tom:Thank you all the same .(还是谢谢你.)