I would say Red as Sika tends to be flat at the ends.
AT THE AGE OF 50 I DECIDED I WAS GOING TO GROW OLD F***ING DISGRACEFULLY
Second one could be human. But I can definitely say I wouldn't like your thumb up my farter.
Try the above link
Both are essentially the same gut system producing the same results, Sika slightly smaller making smaller pellets.
Sika pellets to my mind usually look darker with oily sheen possibly due to higher % of browse in diet
red on the right, left's darker like sika