The A-TYPE song in v1.0 is Minuet. For v1.1, the tune changed to Korobeiniki, which essentially became the
Tetris theme.
The "level-up" sound was changed from a simple beep to a short jingle.
Level 9
Version 1.0 requires you to score 20 lines on Level 9 to proceed to Level 10. This was changed for v1.1 to 100 lines. This was presumably done as if the player started gameplay on Level 9, they would reach Level 10 as soon as they scored only 20 lines. On V1.1, this advance does not happen until you have scored 100 lines (much like most other versions of Tetris).
Block Rotation Glitch
Version 1.0 lets you rotate a block while clearing a line, multiple lines, or a Tetris if there is room in the playing field.
Input during line clears
As with the block rotation, v1.0 also reads the directional input during the line clear delay. This allows you to "charge" the
Delayed Auto Shift which makes the next block start to auto-shift in the direction held immediately after spawning. This is very handy during higher levels. v1.1 doesn't read directional input during the line clear delay, so there's still a pause before the next block starts auto-shifting.
Top Score Screen
The character table in the "high score screen" does not have the "heart" character in the v1.0
Source:
https://tcrf.net/Tetris_(Game_Boy)#Music_and_Sounds
User Notice 
-1.png "Tetris (v1.1) Title Screen")
-2.png "Tetris (v1.1) Screenshot 1")
.jpg "Tetris (v1.1) Box Art Front")
.jpg "Tetris (v1.1) Box Art Back")
-2.png "Daruman Busters (english translation)"){kind=spacer}
.png)
