Is ARM Keil IDE case-sensitive for all ARM assembly instructions? Is it indentation-sensitive?
which default assembler? Depending on which arm compiler toolchain version you are using, v5.x or v6.x?
Check this link https://developer.arm.com/docs/100068/0610/migrating-from-armasm-to-the-armclang-integrated-assembler/symbol-naming-rules
Instead of spending time here on playing "ping-pong" with other forum users, you can search compiler user manual and find answer by yourself