You know, I've been flicking through the US Girls und Panzer BD - has anyone said if even the terrible arrangement of That Song From Tetris used to replace Katyusha was forced on them from the Japanese side?
As it stands, it looks like the scene in question has been almost completely recomposited from the original materials - aside from the obvious removal of lip-flaps, they've changed the timing and speed of a camera pan (even over the Japanese BDs) without any discrepancy in the overlayed snow effects between the two versions. It's clearly been done by the animation studio.
Saying that, the music change alters the effect and impression of the scene so drastically that I honestly think the Crunchy version, with it removed entirely, worked better. If that music came from Japan, it's not only disappointing given the shows otherwise superb use of music, but also displays a hilarious misunderstanding of the tone of the sequence from someone in the proximity of the original staff. Or someone just doesn't give a damn about the foreign audience.
(PS - The BD is Region A+B encoded, should any of the British fellows feel like importing it. Placing it on a B player boots the BD to Hanabee (the Aus licensor) iconography rather than Sentai, so I'd presume the UK release will end up being DVD-only if a co-pressing deal with Aus over the BDs is off the table)