How do you know, that the sounds are made by FH Team?
You also say that it sounds a little bit different...
The mod-teams get their modells, sounds, etc. from community members
The Blitzkrieg-Modder doesn't make any content, unless UI, himself - he only combines the work of other community members.
If the mod uses your property, these guys are to blame, and not the modder, which thinks that his content is made by the community members...