The 38 DGES and 32/36 DGV/DGAV/DGEV are variants of the same "modern" design; the 32/36 has a progressive linkage (smaller fuel-efficient throttle opens before the larger one for power), whereas the 38 has a synchronous linkage (both throttles open simultaneously) with larger same-size barrels, allowing the 38 to breathe better with a built engine that can make good use of it. The 32/36 DFV/DFAV/DFEV is its slightly older forebear design in mirror-image.