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Hi there, This is a great question. Recently I've found that Google is placing high value on photos on a business's GMB profile. Because of this, I suggest that you do not use one set of interior photos for all of the locations. While I don't think you will necessarily get penalized, it's probably best to follow the guidelines Google has in place In case they do penalize you later down the road -- and then you would have to go back and make adjustments after the fact. Even if it takes some time, I would focus on getting photos of each individual location for their profile.