A short time after having switched jobs it proved to be a big mistake. Would it make sense for me to contact the company that made me the other offer?

After a jobhunt I had two nice offers. The first meant more or less a continuation of my previous career, the second something completely new. I chose the second: a dynamic commercial position in a small company. I was in for it! However, after a short time it proved to be a big mistake: it is a complete mismatch. Would it make sense for me to contact the company that made me the other offer?