I had 2 playmates until I was about 10 and they were both girls. I can't say we were terribly interested in each other's genitals. We commonly played naked in the lawn sprinkler in the Summer. That was because cotton underpants have a tendency to head for your ankles when wet. They liked to watch me pee because it was movable unlike theirs. We did spend a bit of time inspecting nipples looking for holes in theirs where the milk would come out. One of the girls liked having me inspect her vulva and all the little sticky parts inside whenever we had the opportunity. I used to use a stick to do it because I didn't like touching those sticky parts. My how things change when you get older.
Did you mean are girls as curious about BOYS as boys are about GIRLS or as boys are about other boys?
I think boys beat out the girls for curiosity but only because parents do their best to keep girls genitals hidden from us while they almost never miss an opportunity to display boys for girls to look at and even touch. When my aunt with her tribe of 13 kids came to visit us it was bath time for baby me. I have my fathers home movies to prove this. My mother would show all the girls how to bathe the baby and how to retract my foreskin to wash under it. So when my cousin showed up with her baby girl when I was about 6 I thought I was going to bathe her. Fugeddaboudit. When they got down to where they wanted her to stand to wash below the waist I was sent out of the room. At home if a girl was visiting when I was in the bath it was perfectly OK for me to be naked in front of her while mother toweled me off on my way to my room to get dressed but if she was staying over I was shuffeled out of sight when she came out of the bath. So I was taught there was something forbidden in a girls pants. Mom didn't know about the neighbor girl and me. I couldn't see what the big deal was.. It looked like girls had nothing but a miniature bottom in the front. At least boys had something that looked different for the girls to look at. I remember in the 6th grade the teacher passed out booklets of Christmas songs with angels all over the covers. I heard the girls giggling and one of them mentioned that angels were boys so they were all looking at the tiny penises on them. What? Children's song books had pictures of penises?