Yes they certainly can be used ... the only thing is one of the tubes needs to be shortened slightly for the triton. Alternatively you can stretch the spring. I prefer the first choice myself. Let me go check my measurements on what the exact lenth should be.
On the Jr. Gent II the larger diameter (upper) tube measures (corrected) 1 57/64 long
the lower barrel tube (smaller diameter) measures 2 3/32 long
The Triton upper tube (large diameter) measures exactly the same (1 57/64)... no trimming required .
The lower tube (smaller diameter) measures 1 55/64.
So trim the Jr. Gent II lower tube to 1 55/64 for the Triton.
Or...... Leave the bottom barrel the same as a jr gent II and just use a longer spring. Either way will work. The difference in length is only 1/8th inch.