KK-837B
https://www.aliexpress.com/item-img/Black-12-Digit-Large-Screen-Calculator-Fashion-Computer-Financial-Accounting-XXM/32796862198.html?spm=a2g11.10010108.1000017.2.3c52d1f9zbEguZ
サイズ: 120*150*35ミリメートル

DZ-837S
https://www.aliexpress.com/item-img/Solar-Calculator-Business-Work-Calculate-Commercial-Tool-Battery-or-Solar-2in1-Powered-12-Digit-Electronic-Calculator/32755974428.html?spm=a2g11.10010108.1000017.2.3c52d1f9KVmyvW
外形寸法:約140*120*50ミリメートル

KT-837A
https://www.aliexpress.com/item-img/Solar-Battery-Light-Powered-Calculator-12-Digits-Office-Home-Portable/32677264243.html?spm=a2g11.10010108.1000017.2.3c52d1f9X80f6y
外形寸法:約150 × 120 × 42ミリメートル

ぱっと見同じに見えるけどサイズが違う
これは型番違いの同一品じゃなくやっぱ別物かな