What is the difference between this and, say, qemu's user mode emulation? IIRC qemu (for both system and user emulation) uses Tiny Code Generator in a similar m

What is the difference between this and, say, qemu's user mode emulation? IIRC qemu (for both system and user emulation) uses Tiny Code Generator in a similar manner when not using hardware virtualization. Is it just a different API geared towards a different purpose, or are there significant differences in the implementation (e.g. a greater focus on security)?