At fIve months of age they are both likely girls at this point you haven’t heard either of them crowing yet? Their combs should be pretty evident by now. Submit the photos when you can but it sounds like their girls from what you’re telling me.They are 5 months yesterday. I'm at work but I sure could tomorrow afternoon. They have a small..pretty small..bump on their heads; both of them. Small waddles still.
You should submit your photos on a Silkie specific thread such as “Silkies they’re simply spectacular” or “the Silkie thread“. Many knowledgeable Silkie folks will review the photos and let you know for sure.
Photo of my 4 1/2 month old boy for comparison, note the streamers coming out of the back of his head the wattles and the comb is pretty evident.