Clown Car => Bren in Bren.
Not really. More like the PE IHT.
HTD => Trenches
Nah.
Button => Button
Yeah. I never really minded Button, though, tbh.
Huge crew support weapons => (moveable) emplacements (extremely hard to kill / dislodge)
Not even close.
Oorah => Heroic Charge
The main features of Heroic Charge including more damage, blobbing on account of the radius and suppression immunity, incentivising vetting an LT ASAP... so, not really.
SU76 + ZIS barrage => non doctrinal powerful artillery
Not even a bit like the Brit howitzer.
Shock troops are exactly the same as Brit Commandos. Highest MP cost for infantry ingame, has smoke bombs, grenades, 6 man squad size, all armed with SMGs, can lay demo charges. The parallels are striking.
Also the dropping from the sky in gliders, demo-laying and the invisibility...
Not that there aren't a few similarities but Qvazar's on the money here. There are a smattering of Brit abilities around but the Brits aren't really closer than anyone else to the end product.