Range of export versions is reduced to comply with international treaties like MTCR. Brahmos being an example.
We are only now getting to the full 800km range as an MTCR member (software locks being removed)
There are numerous examples of foriegn manufacturers reducing the range, resolution or deleting specific radar modes from export versions of systems like US (Raytheon) APY-10 radar on the P-8I.
The US govt mandated GD to come up with an export compliant version of the MQ-9 family (called XP) before seeking foriegn sales.
In Russia's own case, the Bars-R radar on the Su30SM has better range, additional modes than the monkey model Bars sold to us.
Thankfully, we got the source codes as part of the MKI deal which has allowed us to refine its performance over time, through in-house efforts (IAF SDI, etc)
In any case, if the Russian gold standard version got whacked as badly as it has in Ukraine, what hope is there for export models?