b6.2 arms and gear diff on B4.1

[spru]

back after a few years of not driving rc cars spare parts for the b4.1/b4.2 has become very hard to get. So I have following questions:

1. Do b6.2 gullwing arms fit on my old b4.1/b4.2?
2. does the new b6.2 gear diff fit the old b4.1/b4.2 diff box?

Any help is highly appreciated

Thanks,
Raimund