Frankly I don't think you'll need photos. The difference is in the crackin'. Guinea eggs are almost impossibly hard. I can crack a guinea egg but it takes two or three hard whacks on a bowl, and sometimes I can pull hunks of shell off the inner membrane of the raw egg. It's very odd. My silkie's eggs though are just like hen eggs, just a bit smaller. I will say the guineas seem to lay more textured eggs, and with more likelihood of speckles or color oddities. If you post a photo of what you're getting, maybe we can help!
That's what I thought too.
The left side eggs are left in the afternoon. The guineas are using the nesting boxes then if that's their egg.
Just got a right side egg and silkies were in coop. Mystery solved.