No idea what the difference is. the newer software has the higher number, but what extras there are I could not tell. Anyhow, it depends on your machine which format has to be used.
This Q&A section is meant for questions concerning the working of this site and many a seasoned user will never have a look here. Please, repost your question in the Community /Embroidery section and someone might know the answer.
I just noticed you asked this same question a year ago and got some good answers then. Have a look at the link below.