The headline groups the Aztec and Apache as one, and sure, while the Aztec could never have been born without the Apache, they are quite different. From an appearance standpoint, the original potato-like shaped Piper PA-23 Apache is easily distinguishable from the sleeker Aztec.
Moreover, the early Apaches had such modest powerplants that single-engine operation could be hazardous—just as with other twins with small engines. The last versions, the Aztec series, by contrast, are impressively capable load-haulers with good short-field performance, although not exactly speed demons.