The Ove Glove is for the hand that holds the mould handles. I used to get deep tissue heat damage to tje web of my hand and base of index finger running heavy brass moulds hot with Lee handles. After 45 minutes to an hour the heat really sneaks up on you and starts killing cells. The extra cush and grip of the OG is great for when ya gotta whack the pivot bolt with a mallet, something which with a thin glove is in and of itself fatiguing to tendons and cartilage after a few hundred repetitions.
The sprue hand glove needs to be thinner and preferably fairly smooth for wiping smears, picking up dropped sprues, handling a Q-tip, mallet, etc.