The market applauded Green Mountain Coffee Roasters (NASDAQ:GMCR.DL) hiring Coca-Cola (NYSE:KO) executive Brian Kelley as its new CEO yesterday, sending shares as much as 11% higher before settling with only a modest gain.

Kelley -- expected to head up Coca-Cola's North American refreshment business in January before accepting Green Mountain's job offer -- brings years of beverage business and brand building experience to the company behind the Keurig single-cup coffee brewers.

Should SodaStream (NASDAQ:SODA) be worried?

After all, SodaStream has been taking shots at Coca-Cola this year. Can't Kelley fire back now?

No. That's just not going to happen.

Let's get into the important distinction between Green Mountain and SodaStream. Investors love to throw the two companies into the same basket. It's not unusual to see one stock rally just because the other is on the move.

The sympathy plays have never made any sense. Yes, both companies make small kitchen appliances that make beverages. The similarities end there. Green Mountain is a brewer. SodaStream is a carbonator.

That's important. We can't draw the line at hot and cold anymore. Green Mountain has been building up its "Brew Over Ice" line of K-Cup options. It started with iced tea and lemonade that are brewed hot but served over ice to chill out. Green Mountain turned heads last month when it teamed up with Dr. Pepper Snapple Group (NYSE:DPS) to introduce Snapple K-Cups, offering a broad line of fruity tea drinks with a recognizable brand. For its part, SodaStream also offers lemonade and fruit drinks through its partnership with Kraft Foods (NASDAQ:KRFT.DL) for co-branded Crystal Light and Country Time syrups.

Yes, the beverage options are starting to meet in the middle, but one can never forget that SodaStream's versions of these drinks are carbonated. Turning tap water into sparkling water is what the SodaStream machine does. There's a material difference between traditional lemonade and carbonated lemonade. Iced tea and a fruity carbonated beverage are entirely different refreshments.

It's true that SodaStream and Green Mountain can work toward the same cause in promoting the convenience and occasionally eco-friendly nature of making one's own beverage. Both companies are doing well in the education process going by recent growth rates. However, they don't truly compete with one another -- and probably never will.

Brew ha ha
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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.