No, the tik file names are not by titleID, and they could hold tickets for more than one title. That's the thing that makes it a little complicated. When you run tik2sd or look at your system under /storage_slc/rights/ticket/apps, you'll see that the tickets are divided into bucket folders 0-F, with tik files that look like they might go from 0-1F. (Since a ticket file will only exist on a system if there's a ticket in it, it's hard to know what the bounds are.)I assume these tickets r based off of 00050000 followed by the title id?
A given title's ticket seems to end up in the same bucket/file each time, but we don't know how the WiiU determines which bucket it goes in.
Although we don't know the algorithm, tik2sd generates a keys.txt file which shows, for each installed ticket, the titleID, title key, which tik file the ticket is part of, and at what offset.
So, assuming you ran tik2sd under redNAND and renamed sd:/tik2sd to sd:/tik2sd_redNAND afterward, if your sd:/tik2sd_redNAND/keys.txt file shows
Code:
0005000010193400 01234567890123450123456789012345 (000f/00000010.tik@0x0)
0005000e1010ec00 01234567890123450123456789012345 (000f/00000010.tik@0x350)
If you look at the same path on your sysNAND and you don't see a 00000010.tik file there, you could simply copy the file from /sd/tik2sd_redNAND/000f/00000010.tik to /storage_slc/rights/ticket/apps/000f/00000010.tik. But if that file already exists on sysNAND, you'll have to copy both versions of the file to your PC, combine them (in binary mode), eliminate any duplicate tickets (you probably want to keep the sysNAND ticket), and copy the new file back to sysNAND.
If all that sounds like a hassle or risk, and for most people it would be, just reinstall the games. Yes, I'd still use Wupinstaller y mod for that.