I will contact you when i have got my exam results. 同I will contact you when I get my exam results.分別?

實質上可能沒分別，但是作為說這句話的人表達心態/意向有點分別：

I will contact you when i have got my exam results.
心態/意向：我收到考試成績後才聯終你。

I will contact you when I get my exam results.
心態/意向：我收到考試成績便會即刻聯絡你。