There is a change in the air brake and also increase in composite material ,plus new control surface.
Sir it is 1 to 5 m^2 not 1.5 to 2m^2
For Su 30 MKI from Wiki
The forward-facing
NIIP N011M Bars (Panther) is a powerful integrated
passive electronically scanned array radar. The N011M is a digital multi-mode dual frequency band radar.
[45] The N011M can function in air-to-air and air-to-land/sea mode simultaneously while being tied into a high-precision laser-inertial or GPS navigation system. It is equipped with a modern digital weapons control system as well as anti-jamming features. N011M has a 400 km search range and a maximum 200 km tracking range, and 60 km in the rear hemisphere.
[46] The radar can track 15 air targets and engage 4 simultaneously.
[46] These targets can even include
cruise missiles and motionless helicopters. The Su-30MKI can function as a
mini-AWACS as a director or command post for other aircraft. The target co-ordinates can be transferred automatically to at least four other aircraft. The radar can detect ground targets such as
tanks at 40–50 km.
[46] The Bars radar will be replaced by
Zhuk-AESA in all Su-30MKI aircraft.
[47][48][49]
OLS-30
laser-optical
Infra-red search and track includes a day and night
FLIR capability and is used in conjunction with the helmet mounted sighting system. The OLS-30 is a combined IRST/LR device using a cooled, broad waveband sensor. Detection range is up to 90 km, while the laser ranger is effective to 3.5 km. Targets are displayed on the same LCD display as the radar. Israeli
LITENING targeting pod is used to target laser guided munitions. The original Litening pod includes a long range FLIR, a TV camera, laser spot tracker to pick up target designated by other aircraft or ground forces, and an electro-optical point and inertial tracker, which enables engagement of the target even when partly obscured by clouds or countermeasures; it also integrates a laser range-finder and flash-lamp powered laser designator for the delivery of
laser-guided bombs, cluster and general purpose bomb
And some Good News for France
In 2012, upgrades of the earlier 80 Su-30MKIs involves equipping them with stand-off missiles with a range of 300 km; a request for information (ROI) was issued for such weapons.
[38] In 2011, India issued a request for information to MBDA for the integration of the
Brimstone ground attack missile and the long-range
Meteor air-to-air missile.
So Rafale and Su 30 MKI might share weapons also.