if the older one had a Lightweight Hardpoint and the upgraded airframe Had a Heavyweight pylon then this is true
but you can still put all Lightweight Hardpoint weapons on all Lightweight and Heavyweight Hardpoints and you can still put all Heavyweight Hardpoint weapons on all Heavyweight hardpoints
but, it doesn’t matter it you can mount the weapon there, what matters is it the Avionics can use it there
if it wasn’t like this and Gaijin would accept mere Mechanical mounting then the Eurofighter could carry Twin AMRAAM rails on all Hardpoints including the belly one
That was my reason to ask those questions to begin with, i wasn’t sure if Russians reinforced those hardpoints on Su-39 which allowed them to install more munitions.
Ofc avionics plays big parts, without actual codes its pointless to install reinforced/more systems to airframe.
This is the first time im hearing something like that. Curious, where this claim comes from?
The First variant of R27R ( not ER just the R without extended range ) could theoritically be added to it for balance reasons, and be fulfilling since the Su39 face alot of planes that has radar missiles at its BR.
If i remember correctly, there is a mig21 in british TT with R27R at 11.7 ( Not sure! but could provide an example about what it faces, but i am sure about the missile that it have ).