No, Mounce is not a replacement. I just checked Mounce on Daniel 4:17 where it is said that God puts the basest (KJV) or lowest (ASV) of men on the throne. When I checked Mounce in Accordance, neither basest nor lowest (nor base nor low) brought up the Hebrew word for it & its meaning. The intro to Mounce says like, "Not just keyed to KJV." Well, Mounce does not include all the KJV words which you would want to look up. And a work like this should at least have the KJV words, good as it is to add other versions. To find the Mounce entry, I had to go & find the Hebrew word & paste it into the search with Hebrew selected. Then it came up; but that largely defeats the purpose of a Vine's Expository Dictionary.
So I was disappointed to find that Mounce was not a substitute & improvement on Vine. Now I see Vine on Ebay for about $11 in print, but it can be a convenience to have it included in Accordance.
So, I request that Vine be an Accordance module. Aside from being a tool for those who don't know the original languages, Vine's interpretations are in themselves valuable.