Thanks Ruben. I never feel 100% sure about most of my fishes identification to be honest. I've never counted dorsal spines or ventral rows of scales or anything like that. Looking around it seems that L182s can look like 183s, and I saw a post somewhere of someone getting 181s, though that wasn't really that close. Are there any other lookalikes you're aware to look out for?
All I've found is that L183s have bright white spots and the 182s don't, though off course shipping stress screws that. Planet catfish says
[L183 is] the only species with one hard and nine soft dorsal rays
though I'm not sure how to check that, especially in a shop.