The 2R2 is a little bit bigger as far as I can tell. I have one of 'em right here. According to my cheap 1/10mm accuracy Aneng caliper its measurements are ≈10.25 × 10.25 × 3.7mm.
It's a bad choice what CDM has done. I may still go for it, but it is less appealing. And remember it lacks reverse polarity protection, so always stick it right. ;-)
Try sending some PM to Kaidomain's boss BanL. Or posting something here: KD (kaidomain): Deals and new products thread