The 498T and 490T are both Gibson guitar pickups.
The main difference between the two is the 498T has a higher output and a more aggressive tone compared to the 490T.
The 498T is designed to provide a hotter, more powerful sound, with more pronounced mids and highs. This makes it well-suited for harder rock and metal styles.
The 490T is a more vintage-voiced pickup with a lower output, which gives it a more bluesy and classic rock tone.
The 490T is more versatile than the 498T, making it well-suited for a wide variety of genres.