Ok, yeah, got my Buster Prime off the shelf. It doesn't seem to share any of the same parts as Buster and looking at Seibertron's gallery of the Voyager that doesn't match up either so I'm saying new mould not remould.
Thing is while there are some elements that are more movie accurate there are many that are less movie accurate than Buster. Oh well.
EDIT: I wonder if the stock photographer might have him transformed wrong making him look less accurate.