Roguelikes are a pretty specific genre of game that generally feature procedurally generated levels, permadeath, no meta progression, tile-based gameplay, hunger systems, randomized loot appearances, etc. Nethack is probably the best known example of a true roguelike.
Roguelights are a wide variety of games that feature some of the features of true roguelike but not all of them, most commonly procedural generation and permadeath, but most of them feature meta progression.
Honestly if you’ve ever played a true roguelike, the difference is immediately apparent. They’re usually not very similar at all. There’s just a very good chance that you’ve never played one, they’re not exactly wildly popular.
And just to stress: if a game features meta progression it is not a true roguelike. In true roguelikes, you start from zero every time.