Here a bid more info about the VHSA32 carb from Dellorto.
This type off carb is developed for different engines (Example: ROTAX)
Because off this is you have various carbs setup's
Here you have a Dellorto designed for the TZR and one for the ROTAX
One change is directly visible and that is on the TZR you have the water cooling circuit
A other good visible differences is the emulsion tube.
On the ROTAX you have a long end, and on the TZR a shorter one.
A big detail is the air jet correction.
The TZR has a small jet
The ROTAX is closed
One the Left TZR it is a fixed jet
One the Right ROTAX it is a open hole (but blocked by the emulsiontube)
Internal you see the difference better.
The TZR uses the bleed type emulsion tube and the ROTAX not
As you can see there is a small differences between the length in needles.
Be careful if you want to swap needles from different carbs. Make sure you use the correct one.
A TZR125 does need a needle of 68mm long. (U23 for a RR an a U21 for a R)
If you use accidentally a shorter one, the needle can jump out off the needlejet at full throttle keeping your slide wide open.
That is not something you want...