Those are the ones that are supposedly similar to the Sweetones but less expensive, right? (I've been poking around over at chiffandfipple.com). Here's a picture of a D and C Meg together:
The C is bigger, but not as big as my cane B. I sometimes feel like I play my cane whistle better because I'm not so squinched up. But then, sometimes I feel like it's too big.
When I get all my whistles together, I'll post a picture of them.