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At first glance from the numbers. Wlad listed as 6-2, 190; Yohermyn as 6-3, 200.
EDIT: the first site listed him at 200, but two other sites, including the official team site, list him as 6-3, 220. So he's actually quite a bit bigger dude than Wlad.
Wlad at 20: 38 doubles, 8 triples, 25 HR, 160 K at advanced-A Cal League
Yohermyn at 20: 22 doubles, 6 triples, 21 HR, 137 K at low-A Midwest League