Sukhoi Civil Aircraft will aim to align the cockpit of its proposed 75-seat version of the Superjet more closely to that of the Irkut MC-21.
Russian aerospace giant United Aircraft disclosed plans last year to consolidate civil aircraft manufacturing by combining the two airframers.
The Russian trade and industry minister Denis Manturov says the proposed Superjet 75, under development since January, will feature modifications to the wing, powerplant and fuselage.
But he stresses that certain structures and the avionics systems, in particular, will be "unified with the MC-21".
Manturov adds that the aircraft would enter service in late 2022 or early 2023, claiming that there is demand for some 200-300 such jets in Russia, and up to 3,000 in overseas markets.
He spoke as Sukhoi Civil Aircraft celebrated a decade since the Superjet 100's first flight in May 2008.
Sukhoi says there are 127 of the twinjet type in operation, and that the fleet has logged more than 275,000 commercial flights and 420,000h.