The 626SE is an entirely different speaker than the 626R.
The only thing they have in common is the cabinet, and that the 626R evolved from the 626 and 626SE
The true and original 626got its name from the drivers used. That is, a 6" driver, 2" driver, and 6" driver in an MTM set up.
Actually the real designation was QSO626 which meant Quasi-Second Order, refering to the x-over.
The current 626R has only one 6.5" woofer, a Neopanel, and ribbon tweeter.
The 626SE cannot be retro-fitted to match.