They were both using British drawings for the sake of parts interchangeability. When Savage proposed manufacturing shortcuts to increase the productivity rate, LB followed suit.

It's always questioned why UK production didn't step in line and there are some plausible reasons offered. I have heard very good reasons but so far no concrete evidence has surfaced.
Speculation has it they were considering it though. Suspected it's the reason behind some of the 43 Maltbys being erroneously marked as Mk1*.