Ash's Muk

I know that Ash's Muk's original Japanese voice actor Unshō Ishizuka has passed away from his esophageal cancer from the Pokémon main anime until the the Sun and Moon episode Alola Kanto. Because Ash's Muk was present in the only one Master Journeys episode, did somebody available replace a late Unshō Ishizuka as providing his second Japanese voice role as Ash's Muk, or was a late Unshō Ishizuka's voice recording archived for his posthumus voice role as Ash's Muk? What do you think?

So I'm aware Muk shared the same VA as Prof.Oak and since he passed on, is Muk's voice different in PJ068, or is is just reused clips.