Just renaming the tarball will probably not work, as the directories within the tarball do not get renamed. You can try to untar the tarball, rename the freshly untarred mDNSresponder-107.6/ directory to what konstruct wants, then tar up the freshly renamed directory using the same name that konstruct expects for the tarball.
However, this still will NOT work if the patches themselves do not apply cleanly. This means that if the patches are for 107 and if the source code difference between 107 and 107.6 are large enough, the patching won't work. If that's the case, you have to find the 107 version exactly, or get a more recent konstruct that wants 107.6 or try to figure out how to get konstruct to not apply the patches and live with the results.