Newbie with a dumb push rod question

Late 70's sbc, pretty much stock. I am doing the head gaskets ans when i pulled the heads off (in the dark) i didnt realize the push rods are different. I am assuming they are 8 intake and 8 exhaust. 8 of them have the little groove around the tip and 8 do not. I guess the 350's i have owned in the past had after-market push rods because i dont remember them being different. Which ones are which? Any help would be greatly appreciated.

They should be the same length and as long as the hole is open all the way through it dosen't mater

Thank you sir. I was kind of thinking they were the same but ive never been accused of being the smartest person in the world. Yep, all the same size diameter and length but i wasnt 100% sure. When 8 have the little indent ring at the top and 8 dont, i wanted to be sure. Thank you again!