Yes, block 30 cockpit is different than block 50. Panels are in different positions, different panels (exterior lighting, flight control, HSI, IFF, KY-58, Oxygen panel, Avionic Power, CMDS, Radios, etc). Not only panels change by block, they also change over time and from country to country.
As for the other stuff
https://forums.eagle.ru/showpost.php?p=3799781&postcount=183