Generally when two images are essentially the same (which these are, with a couple of small exceptions), the major difference being resolution/file size, the larger picture is considered the parent.
I apologize for the wait! So then, Remilia-sama, your favouri--*BAM*Sakuya × Remilia × Black tea?Ah, Sakuya.Could you prepare something to drink for me?Yes, at once.Remilia-sama, I have made black tea.Ah, yes, thank you.Put it here....
Sakuya... You didn't put any milk in...I'm waiting. Hurry up and bring it here, Sakuya.Eh? I have made a mistake in my work...? I will fix that immediately!