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I think you're worrying too much about possible differences between the Frost and the Yager; I'm reasonably confident that they're identical. In fact, I understand that they come into Canada with Yager badging that has to stripped off and replaced. I also understand that there are no direct bike shipments from Taiwan to Canada; they come from the US importer. So, I can't imagine that there's any difference at all. As for HiFlo's e-mail response, I'd bet they've never heard of a Frost, and therefore won't give a definitive answer to you question.

I just migrated from a Piaggio Fly 150  to a Frost (Yager). I was happy with the functionality of the Fly for my purposes, and had no intention of changing. Then, I saw the new version announcement, and thought the improvements made it worth considering an upgrade. In addition to the engine enhancements, I was particularly interested in the increased under-seat storage (they've moved the gas tank and the battery) and my understanding that they've increased the battery capacity; trust me, the previous little 9AH battery (no room for anything bigger) was a constant source of headaches and anxiety.

I felt that, if I was considering a new Fly, I owed it to myself to look at what else was available. To make a long story short, I found that I could get a new 2012 Frost for a lower OTD price than a 2013 Fly, and in the process, hopefully get away from all the little idiosyncrasies that seem to accompany Piaggio scooters. So far, in my estimation, the Frost has proven to be much more bike than the improved Fly will ever be.

If you go into the Catalogue section of the HiFlo site and search for part HFA5003, you get a list of 10 bikes (all Kymcos) for which the filter is intended. Some of them, including the Dink 200ie, have a notation of "Euro3"; it's not obvious what this implies, but it might have some bearing on its suitability for North American models.