Known facts not in dispute:- Electrical failure evidenced by the RAT deploying and the U/C retraction sequence being interrupted. Slats were deployed as evidenced by post crash photos, and just discernible on high quality vids. Some form of simultaneous engine failure or thrust roll-back...
Tupolev SB 2M-103 no hyphen! The aircraft designation was SB for Скоростной бомбардировщик – Skorostnoi Bombardirovschik – high speed bomber and the engines were 2 M-103s, thus Tupolev SB 2M-103
The Dzus fasteners and floating nut-plates point to 1940s-early 50s. The 45L would be the panel number (as listed on the panel diagram), but this would probably not be British as they tended not to do this. The German cross is a complete red herring, unless it is salvage from a crashed German...