Bass Distinction

I didn’t think this was a largemouth when I caught it, and I didn’t look at it very hard, so I don’t have a great recollection of its specific jawline, and this honestly might sound like a dumb question, but is this a largemouth or a smallmouth? For the last year since I started bass fishing, I’ve always thought I’d been catching purely smallmouth bass, but google tells me this is a largemouth, and now I want a definitive answer. Not that it probably matters too much, but I don’t want to get too happy with the size of these fish if they are in fact largemouth bass. I thought my region had purely smallmouth that’s the main reason I never considered them to be largemouth, and I’ve never gotten one over maybe 4lbs. You guys tell me, I’m just not sure myself, as simple as it may be to tell the difference, so don’t clown me too hard