There is no Bottom Groove like shown for 44301b. However the stud underneath is hollow instead of filled like the picture for 44301b suggests. In Inventories Requests, randyf [...] (57 months ago, Aug 24, 2019, to Inventories Requests)
[...] We don't add alternate minifigures if the only difference is the stud type of the head. So in this case you can add ovr037a as an alternate to the set inventory [...] (57 months ago, Aug 24, 2019, to Inventories Requests)
[...] Looks like you got this minifigure? (Minifigure ovr037a) You can add it as an alternate minifigure to the set. (57 months ago, Aug 23, 2019, to Inventories Requests)
Please make changes to the following inventory: (Set 7641-1) * Add 2 Part 61252 Red Plate, Modified 1 x 1 with Clip Horizontal (thick open O clip) (Alternate) [...] (57 months ago, Aug 23, 2019, to Inventories Requests)