As I understand, the part number of the strap is in the part number of the watch:
I’ve got a 15189ST.OO.D083CU.01 so the original strap is the BR.403.473.083CU.
If you have a 25920ST.OO.0789ST.01, your original strap is the BR.0789.001.ST (code in the third position).
I’ve check that the case of the 15189ST.OO.D083CU.01 fit with the case of the 14790ST.OO.0789ST.10
So the strap BR.403.473.083CU can be mount on the 14790ST and on the 25920ST.
Same for the 2 other alligator straps.
AP will give you only the original strap and not what is possible to do. That’s the reason on the 15189ST.OO.D083CU.01, you have only 3 leather straps.
But I’m sure that the stainless-steel strap BR.0789.001.ST can be mount.
The leather one (BR.403.473.083CU) is 380€
The 2 alligator ones are 500€
And the stainless steel one (BR.0789.001.ST) is 3200€
So if somebody have a stainless steel one to sell in second hand, it could help me !! ;o)