The images aren't clear enough. Like Ranitomeya said, the only way to confirm male or female in a young orchid is to find the V notch in females. With the amount of jumping and running and the fact the notch is super tiny when they're younger I usually don't bother until L4. By L4 males will start developing wingbuds as well, whereas female wingbuds are a lot less pronounced.
Collar colors sometimes do not set in until L5. I have seen some males have greenish collars, it is not a reliable way to *** in my opinion. When I use collar color I also judge by size, wingbud size vs instar to determine ***. Always verify via the V notch though, when you see the notch it's 100% guaranteed female.