Since you are reinstalling the new barrel into an accustock, I would simply take the old lug and use it with the new barrel.
The accustock recoil lugs are shaped slightly differently than the non accustock recoil lugs. They have narrower parallel sides. My guess is that if you relieved the accustock aluminum bedding block for the wider (side-to-side)recoil lug, you would significantly weaken it at that point, which might result in the bedding block cracking.
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