Yes, but there is no significant story crossover between the two series for the duration of OUAT that aired while OUAT in Wonderland aired. After Wonderland concludes, Will Scarlett from Wonderland hangs around Storybrooke for a season, so it's best to watch Wonderland first, if only to understand who the character is. However, it's unclear to me if Scarlett's post-Wonderland appearances on OUAT present a story continuity issue, because his general life status on OUAT seems inconsistent with the events of Wonderland.
