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Are the 378s the same as the S stock for LUL's subsurface lines?

Nope. They're both built by Bombardier in the Derby factory at the same
time, but the designs are different. For example, the 378 carriages are
longer but they have fewer doors. The 378s are the latest incarnation of
the now quite long-running ElectroStar series, whereas the S Stock is
part of the Bombardier Movia family, like its cousin, the 2009 stock.

You'll be able to compare them side-by-side in a year or two on the
Richmond branch.