ASICS Ohana Racer & DS Trainer 12 sizing

Can anyone tell me if the sizing is similar between these two models. I have the DS Trainers 12 and they run small. The Ohana’s, from what I’ve been told are based off the 2100 series last, so I’m assuming the sizing might differ.

Also, does anyone have any knowledge/feedback regarding sizing on the Asics Gel-Noosa (triathlon specific shoe). It looks like it has the same last as the Ohana Racer, but with posting. It isn’t available in the States, but my wife and daughter are going to Paris tomorrow and they are going to try and get me a pair.

Thanks.