Had two brothers from the same litter. sometimes it was so obvious they were brothers, like when they'd sit in an identical pose and watch me with hopeful eyes if I was cooking.
Other times they were nothing alike. Different preferences for food, for attention, for the most comfortable position for a cuddle. Lovely boys. They did have the same vocalisations though, only I could tell the difference just from hearing them!
Only problem is, he won't let you overtake anyone.