here are some key similarities and differences between ARM and AVR to help gauge the difficulty of switching:

Similarities:
* Both ARM and AVR are used in embedded systems and can be programmed using assembly language
* Both architectures have a relatively simple instruction set compared to x86 and other complex architectures
* Both architectures are used in a wide variety of applications, including consumer electronics, automotive, and industrial control systems

Differences:
* ARM is a 32-bit RISC (Reduced Instruction Set Computing) architecture, while AVR is an 8-bit RISC architecture
* ARM is a much more complex architecture than AVR, and is used in more high-performance applications
* AVR is typically used in low-power applications where simplicity and low cost are important considerations
* ARM is a more popular architecture and has a larger user base, so it may be easier to find resources and support for learning and development
* ARM processors tend to have more sophisticated peripherals and features, such as DSP instructions and hardware floating-point units, that make them well-suited for multimedia and signal processing applications
* AVR processors are typically simpler and easier to program, making them a good choice for hobbyist projects and simple embedded systems.

When considering switching from one architecture to another, it's important to assess your goals and needs, as well as the availability of resources and support for the architecture. If you're looking for a higher-performance architecture for complex applications, ARM might be the better choice. On the other hand, if you're looking for a simpler and more affordable architecture for hobbyist projects, AVR might be a better fit.
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