Just thought I'd stick up a photo from this afternoon's (er, yesterday's now) walk. Snowdonia, completely deserted, and some grand light at times. Incredibly saturated ground underfoot (we covered the same ground in July and stayed dry in Inov-8s, no chance today!)
We went up Allt Fawr, Moel Druman and Ysgafell Wen from Crimea Pass. The photo shows the Nantlle Ridge, Moel Hebog and Cnicht, seen from Allt Fawr.
Here you go, both jackets in the stuffsacs they were supplied with. The Yukon (with hood) is in the orange bag on the left. I've put a 12" rule between them for scale.
I'd say there's a bit more "squishability" left in the Minimus bag if I was going to ram them down into a drybag for a day out. But tbh I use my knee to press the air out for that (I don't leave them that way beyond the day out) and they both go down quite a bit smaller.
Both of mine are Drishell btw. The Minimus is older, and the Yukon fabric feels a bit softer, so it's possible they changed the face fabric a little along the way.
i've got a Minimus jacket (no hood) and a Yukon smock (with hood), and no, there isn't a massive difference in packed size. I couldn't say exactly how much (I could always get them out and take a photo later), but I know I squash them down into the same size drybag, and I know that on my ski touring trips when I'm really trying to limit packed weight and bulk, I still never hesitate to take the Yukon.
It looks to me like it's probably a Viento. That jacket had the pair of low zips at the front to creat a tunnel for a pack hipbelt to run behind. I think it was discontinued around 2008 maybe, but it was available in a mid grey like the photo, as you can see on p17 of this pdf brochure from 2006.