What is the difference between an LR44 and AG13 battery?

Multi-Pack EBC Battery LR44 AG13 Premium Alkaline 1.5 Volt Non Rechargeable Round Button Cell Batteries for Watches Clocks Remotes Games Controllers Toys & Electronic Devices

10 x LR44 Battery Equivalent G13 G13A G13-A AG13 V13GA A76 GPA76 1.5V

20 PCS LR44 AG13 357 LR1154 Alkaline Battery 1.55V Button Cell for Wat

LR44/AG13 1.5V Button Cell Batteries Tempero Systems Shopping

PKCELL 40 Count AG13 LR44 Button Cell Alkaline Batteries 1.5V Coin Cell

Battery Beston A76 Lr44 Ag13 - Halim Online

PAIRDEER Super Alkaline LR44 AG13 - 1.5V

Dragon Alkaline Batteries - AG13/LR44 Pack of 10

Sifcon AG13 / LR44 Watch Button Cell Batteries - Pack of 16 - G&T's Original Warehouse