No, given that it is "confirmed" that the distribution is Poisson and the mean is the same, then it will be the same distribution.

But if the means are different (different skill levels) it can still be Poisson distributed (although with different means).

A Poisson regression model can easily be estimated with R (that together with RStudio can be downloaded free). Show us the data set (correctly specified!) and we will help you. I guess that you can estimate it in excel, since it can be done like iterative-reweighted-least-squares, but that seems like the most difficult path.