Yes—this can happen because cards with similar capacity can have very different internal performance and controllers. Your Lexar 1000x is a UHS-II card, while the SanDisk Extreme Plus is UHS-I, so they are not in the same speed class.

In-camera formatting isn’t just an instant reset; it still involves writing metadata and the card’s flash controller managing erase/write operations. Flash memory often must erase blocks before rewriting them, and cards handle this differently. If a card has fewer pre-erased blocks available, slower erase behavior, or more overhead from wear-leveling and internal housekeeping, formatting can take much longer.

So the likely reasons are:

• different bus/speed class (UHS-II vs UHS-I)
• different real-world write/erase performance
• different controller/firmware behavior inside the card
• flash-memory management such as wear-leveling and block erasure

A small capacity difference between brands is normal and not the main cause. The slower format time does not necessarily mean the card is faulty, just that its internal design and speed are different.