Normally the id does not pose a problem but when you install a game it creates a partition with 32 charecters max so if a game has the same ID and the first 17 charecters of the title then it will consider this game as already installed
To work around this you need to change the partition name with wLaunchELF
Example:
Your second game that has the same gameid must be different from the first like
My First Game with same gameid:
PP.SLES-51061..GRAND_THEFT_AUTO
Second Game with same gameid:
PP.HACK-51061..GRAND_THEFT_AUTO
Yes I know how to workaround this changing the game's ID. Actually I was hoping that your program doesn't allow to install games with same ID.
I used
HDL dump helper gui for years. That program doesn't allow you to install games with the same first characters (22 I seems to remember, starting from the actual game's name, not ID), even if the ID is different.
It was a problem for games as
Shin megami Tensei series and many others. I see your program doesn't has that limit, I already installed a lot of games with the same 22 and even more characters.
As for IDs
HDL dump helper allows you to install all games with the same ID you want (as long as the names are not the same in the first characters as I explained above). That was actually a problem. It happened to me once to install 2 times the same game for mistake, then deleting it after will probably lead to fragmentation...
If your program doesn't allow at all to install 2 games with the same ID (also in different installing sessions) is the best thing imho.
In the example I mentioned I was installing
namco museum and
namco museum 50th anniversary edition and your program didn't installed the second one (it was in a single installing session).
This is a particular case of 2 different games with the same ID (easilly solvable by changing the ID of one of them. I had to do it also for cover arts).
Namco Museum is just 12 characters (counting also the space), so it matters 17 characters starting from PP.??