I am pretty sure that your air cooled snow blower requires a different type of two stroke lubricant… Perhaps it would be OK to add some of the proper lube to the mix, which would richen the mixture to 24:1, and use up the old fuel/oil mix that way…..
We have very few snow blowers here, but I sort of doubt it gets hot enough where you are to require the more heat tolerant two-stroke oil. Oops, there I go again, replying to an oil question.
That 50 to 1 gas should work fine in your snow blower. The only tools I’ve heard of problems with using marine oil are chainsaws because they can get so hot, especially in the summer; but I’ve used the same gas/oil in my Stihl and Husquvarna chainsaws for 20 years without problems; but I use 25 to 1 in the Husquvarna because the instructions call for more oil if I don’t use their brand. Your snowblower shouldn’t get all that hot.