How does vehicle customization differ between gta online and single player?

The only information available from the cited source describes Grand Theft Auto Online as an online multiplayer action‑adventure game set in the same world as Grand Theft Auto V, allowing up to 30 players to explore San Andreas. It does not mention vehicle customization options or how they might differ between the online and single‑player experiences. Therefore, based solely on the evidence supplied, no comparison of vehicle customization can be made.