Thank you for your response GROHOT.
So only TK-208 was modernized and received new name "Dmitriy Donskoy", but RA has 3 Typhoon Improved (941U) (Arkhangel'sk, Dmitriy Donskoy and Severstal')
Your link says TK-208 was 12 years in overhaul and modifications, which resulted in it being considered as a fourth-generation submarine due to those extensive modifications.
It's clear it was refitted to serve as platform to the new SLBM (Bulava), but it's not clear if it received better sensors and quietening equipment.
Best regards.
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