Mixed Up My TS25 Lights

I have both the 519A and LH351D versions and I'd like to determine which is which. Is there an easy way for me to tell? Do I need to take the bezel off and take a photo? Please help! 🥴

Edit: Here is a photo of both lights opened https://i.imgur.com/NC2L46i.jpeg

Is the 519A smaller than the LH351D?