If the snapper moter units is broke are the attachments(tiller,weed-eater and blower)usable on another compatible brand?Like Poulan,etc.

There are some models that can be interchanged simply by the fact that Poulon makes several other brands. I don't recall that Snapper even makes a weedeater so they may have their name on a Poulon built unit. MTD also builds for many other brand names. What is wrong with your Snapper engine? Maybe we can fix that instead.