Aw I thought we might have to get a bit more forensic.
It appears the names it picks are based on the internal serials of the game (which vary from region to region, though not always revision to revision).
http://advanscene.com/html/index.php has a nice search option
On searching for superstar
1229
Mario & Luigi - Superstar Saga
Europe AGB-A88P-EUR Eeprom v124 - 64 kbit 128 Mbit
1260
Mario & Luigi - Superstar Saga
USA AGB-A88E-USA Eeprom v124 - 64 kbit 128 Mbit
Would appear then to be the USA version of it.
You can also search for the serial with that so
Found 2 entries matching "AX4E" in "GB Releases", "GBC Releases", "GBA Releases", "Pure", "X-Files", "NDS Releases", "NDS Pre Scene Releases", "3DS Releases" and "PSP PSN & PSV Releases"
# Title (click on title for more details) Dupeid Region Serial Save Type (Save Size PSP) Size
1195
Super Mario Advance 4 - Super Mario Bros. 3
USA AGB-AX4E-USA Flash v102 - 1024kbit 32 Mbit
2140
Super Mario Advance 4 - Super Mario Bros. 3
USA AGB-AX4E-USA Flash v102 - 1024kbit 32 Mbit
The higher number one appears to be a later revision (haven't looked to see what goes -- could be bug fixes, could be censorship, could be the wii u version with built in ereader stuff...). Saves may or may not cross region barriers (always worth a try) but v1.0 to v1.1 tends to still work just fine.